//fading images based (heavily) on code from http://www.brothercake.com/

var LOGO_FILENAME = 0;
var LOGO_LINK = 1;

//init
logo_Cache = new Array();
for (i = 0; i < logo_Logos.length; i++) {
	logo_Cache[i] = new Image;
	logo_Cache[i].src = logo_Path + logo_Logos[LOGO_FILENAME];
}

var logoClock;
var currentIndex;
function goYeah(){
	obj.style.display = 'inline';
}
function LoadLogos() {

	if (logo_Logos.length > 0) {

		//set initial logo
		var r = Math.ceil(Math.random() * logo_Logos.length) - 1;
		currentIndex = r;
		
		obj = MM_findObj('imgLogos');
		obj_a = MM_findObj('lnkLogos');
		
		obj.src = logo_Path + logo_Logos[r][LOGO_FILENAME];
		setTimeout('goYeah()', 250);
		obj_a.href = logo_Logos[r][LOGO_LINK];

		if (logo_Logos.length > 1)
			setTimeout('delayedStart()', 3000);
	} else {
		obj = MM_findObj('logoContainer');
		obj.style.display = 'none';
		obj = MM_findObj('logoText');
		obj.style.display = 'none';
	}
}

function delayedStart() {
	switchLogo();
	logoClock = setInterval('switchLogo()', 6000);
}

function switchLogo() {

	//var r = Math.ceil(Math.random() * logo_Logos.length) - 1;
	//if (r == currentIndex)
	//	r = Math.abs(r-1);
	
	r = (currentIndex - 0) + 1;
	
	if (r >= logo_Logos.length)
		r = 0;
		
	currentIndex = r;
	
	crossfade(MM_findObj('imgLogos'), logo_Path + logo_Logos[r][LOGO_FILENAME],
		MM_findObj('lnkLogos'), logo_Logos[r][LOGO_LINK], 1);
}

var ixf = { 'clock' : null, 'count' : 1 }

//crossfade setup function
function crossfade(obj_img, image_src, obj_a, a_url, delay, alt_text) {

	//if the timer is not already going
	if (ixf.clock == null) {
	
		//copy the image object 
		ixf.obj = obj_img;
		
		//copy the image src argument 
		ixf.src = image_src;
		
		ixf.obj_a = obj_a;
		ixf.src_a = a_url;
		
		//store the supported form of opacity
		if (navigator.userAgent.indexOf('Netscape6/6.2') > 0)
			ixf.type = 'none';
		else if (typeof ixf.obj.style.opacity != 'undefined') {
			ixf.type = 'w3c';
		}
		else if(typeof ixf.obj.style.MozOpacity != 'undefined') {
			ixf.type = 'moz';
		}
		else if(typeof ixf.obj.style.KhtmlOpacity != 'undefined') {
			ixf.type = 'khtml';
		}
		else if(typeof ixf.obj.filters == 'object') {
			//weed out win/ie5.0 by testing the length of the filters collection (where filters is an object with no data)
			//then weed out mac/ie5 by testing first the existence of the alpha object (to prevent errors in win/ie5.0)
			//then the returned value type, which should be a number, but in mac/ie5 is an empty string
			ixf.type = (ixf.obj.filters.length > 0 && typeof ixf.obj.filters.alpha == 'object' && typeof ixf.obj.filters.alpha.opacity == 'number') ? 'ie' : 'none';
		}
		else {
			ixf.type = 'none';
		}
		
		//change the image alt text if defined
		if(typeof alt_text != 'undefined' && alt_text != '') {
			ixf.obj.alt = alt_text;
		}
		
		//if any kind of opacity is supported
		if (ixf.type != 'none') {
			//create a new image object and append it to body
			//detecting support for namespaced element creation, in case we're in the XML DOM
			ixf.newimg = document.getElementsByTagName('body')[0].appendChild((typeof document.createElementNS != 'undefined') ? document.createElementNS('http://www.w3.org/1999/xhtml', 'img') : document.createElement('img'));

			//set positioning classname
			ixf.newimg.className = 'idupe';
			
			//set src to new image src
			ixf.newimg.src = ixf.src

			//move it to superimpose original image
			ixf.newimg.style.left = ixf.getRealPosition(ixf.obj, 'x') + 'px';
			ixf.newimg.style.top = ixf.getRealPosition(ixf.obj, 'y') + 'px';
			
			//copy and convert fade duration argument 
			ixf.length = parseInt(delay, 10) * 1000;
			
			//create fade resolution argument as 15 steps per transition
			ixf.resolution = parseInt(delay, 10) * 15;
			
			//start the timer
			ixf.clock = setInterval('ixf.crossfade()', ixf.length/ixf.resolution);
		}
		
		//otherwise if opacity is not supported
		else {
			//just do the image swap
			ixf.obj.src = ixf.src;
			ixf.obj_a.href = ixf.src_a;
		}
	}

}

//crossfade timer function
ixf.crossfade = function() 
{
	//decrease the counter on a linear scale
	ixf.count -= (1 / ixf.resolution);
	//if the counter has reached the bottom
	if(ixf.count < (1 / ixf.resolution)) {
		//clear the timer
		clearInterval(ixf.clock);
		ixf.clock = null;
		
		//reset the counter
		ixf.count = 1;
		
		//set the original image to the src of the new image
		ixf.obj.src = ixf.src;
		//alert('d');
			//ixf.obj.src = ixf.newimg;
		ixf.obj_a.href = ixf.src_a;
		//doThaRest();
//alert('ho');
		setTimeout("doThaRest()",250);

	}
	else{
		doThaRest();
	}
	
	
};


//get real position method
ixf.getRealPosition = function()
{
	this.pos = (arguments[1] == 'x') ? arguments[0].offsetLeft : arguments[0].offsetTop;
	this.tmp = arguments[0].offsetParent;
	while(this.tmp != null)
	{
		this.pos += (arguments[1] == 'x') ? this.tmp.offsetLeft : this.tmp.offsetTop;
		this.tmp = this.tmp.offsetParent;
	}
	
	return this.pos;
};

function doThaRest(){
	//set new opacity value on both elements
	//using whatever method is supported
	switch(ixf.type) {
		case 'ie' :
			ixf.obj.filters.alpha.opacity = ixf.count * 100;
			ixf.newimg.filters.alpha.opacity = (1 - ixf.count) * 100;
			break;
			
		case 'khtml' :
			ixf.obj.style.KhtmlOpacity = ixf.count;
			ixf.newimg.style.KhtmlOpacity = (1 - ixf.count);
			break;
			
		case 'moz' : 
			//restrict max opacity to prevent a visual popping effect in firefox
			ixf.obj.style.MozOpacity = (ixf.count == 1 ? 0.9999999 : ixf.count);
			ixf.newimg.style.MozOpacity = (ixf.count == 0 ? 0.999999 : (1 - ixf.count));
			break;
			
		default : 
			//restrict max opacity to prevent a visual popping effect in firefox
			ixf.obj.style.opacity = (ixf.count == 1 ? 0.9999999 : ixf.count);
			ixf.newimg.style.opacity = (ixf.count == 0 ? 0.999999 : (1 - ixf.count));
			break;
	}
	
	//if the counter is at the top, which is just after the timer has finished
	if (ixf.count == 1) {
		//remove the duplicate image
		ixf.newimg.parentNode.removeChild(ixf.newimg);
		return;
	}
	
	//now that we've gone through one fade iteration 
	//we can show the image that's fading in
	ixf.newimg.style.visibility = 'visible';
	
	//keep new image in position with original image
	//in case text size changes mid transition or something
	//ixf.newimg.style.left = ixf.getRealPosition(ixf.obj, 'x') + 'px';
	//ixf.newimg.style.top = ixf.getRealPosition(ixf.obj, 'y') + 'px';
}