function fadeinfadeout(id, opacS, opacE, millisec) 
{
	
	displayID = id + '_txt';
	document.getElementById(displayID).style.display = 'block';
	//Om de vorige weer in te faden zoek uit welke dat is
	for(x=1;x<6;x++)
	{
		if(document.getElementById('img_home' + x).style.opacity != 1)
		{			
			if(document.getElementById('img_home' + x).style.opacity)
			{
				txtID = 'img_home' + x + '_txt';
				opacity('img_home' + x, opacE, opacS, millisec);
				document.getElementById(txtID).style.display = 'none';
			}
		}
	}	
	
	var opac = 0;
	if(!document.getElementById(id).style.opacity){opac = 1;}
	else{opac =	document.getElementById(id).style.opacity;}
	if(opac == 1)
	{
		opacStart = opacS;
		opacEnd   = opacE;
	}
	else
	{
		opacStart = opacE;
		opacEnd   = opacS;
	}
		
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	for(i = opacStart; i >= opacEnd; i--) 
	{
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
	
	for(i = opacStart; i <= opacEnd; i++)
	{
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
}


function fadeinfadeout_menu(id, opacS, opacE, millisec) 
{
	
	clearTimeout (t); 
	
	if (document.getElementById("menuactive").innerHTML == '1') {
		document.getElementById("menu").style.display = "none";
		document.getElementById("menuactive").innerHTML = '0';
	}
	else {
		document.getElementById("menu").style.display = "block";
		document.getElementById("menuactive").innerHTML = '1';
	}
	
	var opac = 0;
	if(!document.getElementById(id).style.opacity){opac = 1;}
	else{opac =	document.getElementById(id).style.opacity;}
	if(opac == 1)
	{
		opacStart = opacS;
		opacEnd   = opacE;
	}
	else
	{
		opacStart = opacE;
		opacEnd   = opacS;
	}
		
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	for(i = opacStart; i >= opacEnd; i--) 
	{
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
	
	for(i = opacStart; i <= opacEnd; i++)
	{
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
}


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 ivisible
	if(document.getElementById(id).style.opacity == 1) {
		opacity(id, 1, 99, millisec);
	} else {
		opacity(id, 99, 1, 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(1, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;
	
//	document.getElementById(imageid).src = imagefile;
	
	
	//fade in image
	for(i = 10; i <= 99; i++) {
		
		
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		
		
		timer++;

		
	}
	
	
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 1;
	

	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 99) {
		currentOpac = document.getElementById(id).style.opacity * 100;
		
	}
	
	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}