var timer;
var current_location = 1;
var next_location = 1; 
var pics_loaded = 0;
var onoff = 0;
var direction = 1;
var timeout_value;
var images = new Array;
var photo_urls = new Array;
var photo_captions = new Array;
var photo_comment = new Array;
var photo_user_epic_comment = new Array;
var transitionNames = new Array;
var transitions = new Array;
var current_transition = 5;
var loop = 1;
var chDir_src = new Array;

chDir_src[2] = "/stylesheets/axgallery/buttons/ani_forw.gif";
chDir_src[0] = "/stylesheets/axgallery/buttons/ani_backw.gif";
chDir_src[1] = "/stylesheets/images/spacer.gif";

transitions[0] = "progid:DXImageTransform.Microsoft.Fade(duration=1)";
transitions[1] = "progid:DXImageTransform.Microsoft.Blinds(Duration=1,bands=20)";
transitions[2] = "progid:DXImageTransform.Microsoft.Checkerboard(Duration=1,squaresX=20,squaresY=20)";
transitions[3] = "progid:DXImageTransform.Microsoft.Strips(Duration=1,motion=rightdown)";
transitions[4] = "progid:DXImageTransform.Microsoft.Barn(Duration=1,orientation=vertical)";
transitions[5] = "progid:DXImageTransform.Microsoft.GradientWipe(duration=1)";
transitions[6] = "progid:DXImageTransform.Microsoft.Iris(Duration=1,motion=out)";
transitions[7] = "progid:DXImageTransform.Microsoft.Wheel(Duration=1,spokes=12)";
transitions[8] = "progid:DXImageTransform.Microsoft.Pixelate(maxSquare=10,duration=1)";
transitions[9] = "progid:DXImageTransform.Microsoft.RadialWipe(Duration=1,wipeStyle=clock)";
transitions[10] = "progid:DXImageTransform.Microsoft.RandomBars(Duration=1,orientation=vertical)";
transitions[11] = "progid:DXImageTransform.Microsoft.Slide(Duration=1,slideStyle=push)";
transitions[12] = "progid:DXImageTransform.Microsoft.RandomDissolve(Duration=1,orientation=vertical)";
transitions[13] = "progid:DXImageTransform.Microsoft.Spiral(Duration=1,gridSizeX=40,gridSizeY=40)";
transitions[14] = "progid:DXImageTransform.Microsoft.Stretch(Duration=1,stretchStyle=push)";
transitions[15] = "special case";

var transition_count = 15;

var slideShowLow = "slides.php3?slideId=3451";

/*
// Browser capabilities detection ---
// - assume only IE4+ and NAV6+ can do image resizing, others redirect to low 
if (is_ie4up || is_nav6up) {
    //-- it's all good ---
} else {
    //-- any other browser we go low-tech ---
    document.location = slideShowLow;
}
*/

// - IE5.5 and up can do the blending transition.
var browserCanBlend = (is_ie5_5up);

function stopOrStart() {
    if (onoff) {
	stop();
    } else {
	play();
    }
}

function toggleLoop() {
    if (loop) {
	loop = 0;
    } else {
	loop = 1;
    }
}

function changeElementText(id, newText) {
    element = document.getElementById(id);
    element.innerHTML = newText;
}

function stop() {
	document.changeDirectionImg.src = chDir_src[1];
    changeElementText("selectTime", "");    
    if (browserCanBlend) {
    	changeElementText("selectTrans", "");
    }
    onoff = 0;
    status = "The slide show is stopped, Click [play] to resume.";
    clearTimeout(timer);
}

function play() {
    if (!onoff) {
		document.changeDirectionImg.src = chDir_src[direction + 1];
	    changeElementText("selectTime", "<select name='time' size=1  onchange='play()' style='font-family: Verdana,Arial, Helvetica; font-size: 10px; width: 40px; color : #FFFFFF; background-color: #8F9194; border-color:#8F9194; '><option value=1 > 1s<option value=2> 2s<option value=3 > 3s<option value=4 selected> 4s<option value=5 > 5s<option value=10 > 10s<option value=15 > 15s<option value=30 > 30s<option value=45 > 45s<option value=60 > 60s</select>");
	    if (browserCanBlend) {
	        changeElementText("selectTrans", "<select name='transitionType' size=1  onchange='change_transition()' style='font-family: Verdana,Arial, Helvetica; font-size: 10px; width: 90px; color : #FFFFFF; background-color: #8F9194; border-color:#8F9194; '> <option value=0> Blend <option value=1 > Blinds <option value=2 > Checker <option value=3 > Diagonal <option value=4 > Doors <option value=5 selected> Gradient <option value=6 > Iris <option value=7 > Pinwheel <option value=8 > Pixelate <option value=9 > Radial <option value=10 > Rain <option value=11 > Slide <option value=12 > Snow <option value=13 > Spiral <option value=14 > Stretch <option value=15 > RANDOM! </select>");
    	}
	}
    onoff = 1;
    status = "Slide show is running...";
    go_to_next_photo();
}

function next() {   
    direction = 1;
    /* Calculate the new next location */
    next_location = (parseInt(current_location) + parseInt(direction));
    if (next_location > photo_count) {
	next_location = 1;
	if (!loop) {
	    stop();
	}
    }
    if (next_location == 0) {
        next_location = photo_count;
	if (!loop) {
	    stop();
	}
    }
    current_location=next_location;
    preload_photo(current_location);
    document.slide.src = images[current_location].src;
    setCaption(photo_captions[current_location],photo_comment[current_location],photo_user_epic_comment[current_location]);
    if (onoff==1)
    	stop();
}

function prev() {
    direction = -1;
    /* Calculate the new next location */
    next_location = (parseInt(current_location) + parseInt(direction));
    if (next_location > photo_count) {
	next_location = 1;
	if (!loop) {
	    stop();
	}
    }
    if (next_location == 0) {
        next_location = photo_count;
	if (!loop) {
	    stop();
	}
    }    
    current_location=next_location;
    preload_photo(current_location);
    document.slide.src = images[current_location].src;
    setCaption(photo_captions[current_location],photo_comment[current_location],photo_user_epic_comment[current_location]);
    if (onoff==1)
    	stop();
}

function cont() {
    /* Calculate the new next location */
    direction = 1;
    next_location = (parseInt(current_location) + parseInt(direction));
    if (next_location > photo_count) {
	next_location = 1;
	if (!loop) {
	    stop();
	}
    }
    if (next_location == 0) {
        next_location = photo_count;
	if (!loop) {
	    stop();
	}
    }
    current_location=next_location;
    preload_photo(current_location);
    document.slide.src = images[current_location].src;
    setCaption(photo_captions[current_location],photo_comment[current_location],photo_user_epic_comment[current_location]);
    if (onoff==1)
    	stop();
}

function changeDirection() { 
    if (direction == 1) {
		direction = -1;
    } 
    else {
		direction = 1;
    }
	document.changeDirectionImg.src = chDir_src[direction + 1];
    setCaption(photo_captions[current_location],photo_comment[current_location],photo_user_epic_comment[current_location]);
    preload_next_photo();
}

function change_transition() {
    current_transition = document.TopForm.transitionType.selectedIndex;
}

function preload_complete() {
}

function reset_timer() {
    clearTimeout(timer);
   
    if (onoff) {
         
	timeout_value = document.TopForm.time.options[document.TopForm.time.selectedIndex].value * 1000;
	timer = setTimeout('go_to_next_photo()', timeout_value);
	
    }
}

function wait_for_current_photo() {
    /* Show the current photo */
    if (!show_current_photo()) {
	/*
	 * The current photo isn't loaded yet.  Set a short timer just to wait
	 * until the current photo is loaded.
	 */
	status = "Picture is loading...(" + current_location + " of " + photo_count + ").  Please Wait..." ;
	clearTimeout(timer);
	timer = setTimeout('wait_for_current_photo()', 505);
	return 0;
    }
    else {
	status = "Slide show is running...";
	preload_next_photo();
	reset_timer();
    }
}

function go_to_next_photo() {
    /* Go to the next location */
    current_location = next_location;
    /* Show the current photo */
    if (!show_current_photo()) {
	wait_for_current_photo();
	return 0;
    }
    preload_next_photo();
    reset_timer();
}

function preload_next_photo() {    
    /* Calculate the new next location */
    next_location = (parseInt(current_location) + parseInt(direction));
    if (next_location > photo_count) {
	next_location = 1;

	if (!loop) {
	    stop();
	}
    }
    if (next_location == 0) {
        next_location = photo_count;
	if (!loop) {
	    stop();
	}
    }    
    /* Preload the next photo */
    preload_photo(next_location);
}

function show_current_photo() {
    /*
     * If the current photo is not completely loaded don't display it.
     */
    if (!images[current_location] || !images[current_location].complete) {
	preload_photo(current_location);
	return 0;
    }
    /* transistion effects */
    if (browserCanBlend){
		var do_transition;
		if (current_transition == (transition_count)) {
		    do_transition = Math.floor(Math.random() * transition_count);
		} 
	        else {
		    do_transition = current_transition;
		}
		document.images.slide.style.filter=transitions[do_transition];
		document.images.slide.filters[0].Apply();
    }
    document.slide.src = images[current_location].src;
    setCaption(photo_captions[current_location],photo_comment[current_location],photo_user_epic_comment[current_location]);    
    if (browserCanBlend) {
	document.images.slide.filters[0].Play();
    }
    return 1;
}

function preload_photo(index) {
	var location;
    /* Load the next picture */
    if (pics_loaded < photo_count) {
		/* not all the pics are loaded.  Is the next one loaded? */
		if (!images[index]) {
		    images[index] = new Image;
		    images[index].onLoad = preload_complete();
			location = String(window.location);
			if (location.indexOf('?') > -1)
				location = location.substring(0,location.indexOf('?'));
			if (location.indexOf('#') > -1)
				location = location.substring(0,location.indexOf('#'));
		    images[index].src = location + photo_urls[index];
		    pics_loaded++;
		}
    } 
}

function setCaption(text,comment,user_comment) {
    changeElementText("number", current_location + "/" + photo_count);
    img = document.getElementById("slide");
    img.setAttribute("alt",text);
    img.setAttribute("title",text);
    img.setAttribute("longdesc",comment);
//    changeElementText("user_epic_comment", user_comment);
    changeElementText("comment", comment);
}