onload = function hideClass() {
	var e, i = 0;
	while (e = document.getElementsByTagName ('*')[i++]) {
		
		if (/\bhide\b/.test (e.className)) {
		e.style.opacity = 0;
		e.style.MozOpacity = 0;
		e.style.KhtmlOpacity = 0;
		e.style.filter = "alpha(opacity=0)";
		e.style.display = "none";
		}	
	}
}

function showAbout(n)
	{
	var e, i = 0;
	if (document.getElementById)
			{
			while (e = document.getElementById ('about' + i++))
				{			
			e.style.opacity = 0;
			e.style.MozOpacity = 0;
			e.style.KhtmlOpacity = 0;
			e.style.filter = "alpha(opacity=0)";
			e.style.display = "none";
			}
			
		var aboutBox = document.getElementById("about"+n);
		aboutBox.style.display="block";
	}
}

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 changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it invisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 99, millisec);
	} else {
		opacity(id, 99, 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);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 99; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	} 
}

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) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

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