/* blending code by http://brainerror.net/scripts/javascript/blendtrans/
BUT fixed for firefox*/
var tocancel = new Array();
var tohide = null;

function cancellastblend() {
	var i;
	var cancel;
	
	for(i=0;i<tocancel.length;i++) {
		cancel = tocancel[i];
		clearTimeout( cancel );
	}
	
	tocancel = new Array();
}

function sethidewhileblend(divid) {
	tohide = divid;
}

function showDiv(divid, flag) {
	if(divid) {
		var obj = document.getElementById(divid); 
		if(!obj) return;
		
		if(flag) {
			obj.style.display = 'block';
		}
		else {
			obj.style.display = 'none';
		}
	}
}

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeSrc(file, id) {
	var obj = document.getElementById(id); 
	obj.src = file;
}

function changeOpac(opacity, id) {
	var obj = document.getElementById(id); 
	opacity = (opacity == 100)?99.999:opacity; //ff
	opacity = (opacity == 0)?0.1:opacity;	//ff
	
	// IE/Win
	obj.style.filter = "alpha(opacity:"+opacity+")";
	
	// Safari<1.2, Konqueror
	obj.style.KHTMLOpacity = opacity/100;
	
	// Older Mozilla and Firefox
	obj.style.MozOpacity = opacity/100;
	
	// Safari 1.2, newer Firefox and Mozilla, CSS3
	obj.style.opacity = opacity/100;
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url('" + document.getElementById(imageid).src + "')";
	
	//make image transparent
	changeOpac(0, imageid);
	
	tocancel[0] = setTimeout("changeSrc('" + imagefile + "','" + imageid + "')",450); //ff is slow as hell - for that we need the timeout

	//fade in image in 500
	tocancel = new Array(102);
	
	tocancel[0] = showDiv(tohide, 0);
	for(i = 0; i <= 100; i++) {
	
		tocancel[i+1] = setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed)+500);
		timer++;
	}
	tocancel[102] = setTimeout("showDiv('"+tohide+"', 1)",(timer * speed)+500);
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		 entOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}