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.display == 'none') {
        document.getElementById(id).style.display = 'block';
        opacity(id, 0, 100, millisec);
    } else {
        document.getElementById(id).style.display = 'none';
        opacity(id, 100, 0, millisec);
    }
}

function divload(page,usediv) {
    if(document.getElementById(usediv).style.display == 'block') {
				shiftOpacity(usediv, 500);
				document.getElementById('pic' + usediv).src = 'pic/plus.gif';
    } else {

         try {xmlhttp = window.XMLHttpRequest?new XMLHttpRequest(): new ActiveXObject("Microsoft.XMLHTTP");}  catch (e) { alert("Error: Could not load page.");}
  	   document.getElementById('laddarbild' + usediv).style.display = 'block';
         document.getElementById('laddarbild' + usediv).innerHTML = '<img src="../pic/loading1.gif" border=0>';
         scroll(0,0);
         xmlhttp.onreadystatechange = function(){
                 if ((xmlhttp.readyState == 4) && (xmlhttp.status == 200)) {
  	   			document.getElementById('laddarbild' + usediv).style.display = 'none';
                        document.getElementById(usediv).innerHTML = xmlhttp.responseText;
				shiftOpacity(usediv, 500);
				document.getElementById('pic' + usediv).src = 'pic/minus.gif';
                 }
         }
         xmlhttp.open("GET", page);
         xmlhttp.send(null);
}
}

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 <= 100; 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)
}