// Navigation rollover effect
function navrollover(li_id){
	document.getElementById(li_id).style.background='url(navigation/navbackground.jpg) no-repeat';
	document.body.style.cursor = 'pointer';
}
function navrollout(li_id){
	document.getElementById(li_id).style.background='url(navigation/navbackground3.gif) no-repeat';
	document.body.style.cursor = 'default';
}


// subNavigation rollover effect
function navsubrollover(li_id){
	document.getElementById(li_id).style.background='url(navigation/navsub_over.jpg)';
	document.body.style.cursor = 'pointer';
}
function navsubrollout(li_id){
	document.getElementById(li_id).style.background='url(navigation/navsub_default.jpg)';
	document.body.style.cursor = 'default';
}

// with subnav indicator
function navsubrollover_l(li_id){
	document.getElementById(li_id).style.background='url(navigation/navsub_over_l.jpg)';
	document.body.style.cursor = 'pointer';
}
function navsubrollout_l(li_id){
	document.getElementById(li_id).style.background='url(navigation/navsub_default_l.jpg)';
	document.body.style.cursor = 'default';
}





// display element by ID
function display(displayID){
	document.getElementById(displayID).style.display='block';
}
// hide element by ID
function hide(displayID){
	document.getElementById(displayID).style.display='none';
}






// display:block; / display:none
function showItem(item){
	document.getElementById(item).style.display='block'; 
}

function hideItem(item){
	document.getElementById(item).style.display='none'; 
}








// Clear Absolutes
function SI_clearAbsolutes() {
	var d = document;
	if (!d.getElementsByTagName) return;
	divs = d.getElementsByTagName('div');
	for (i=divs.length-1;div=divs[i];i--) {
		if (div.className.indexOf('si-clear-absolutes')!=-1) {
			// Make an array of the rendered heights of the contained elements
			oh = []; for (j=0;j<div.childNodes.length;j++) { c = div.childNodes[j]; if (c.nodeName=='DIV') { oh[oh.length] = parseInt(c.offsetHeight); }}
			// Determine the max height
			h = 0; for (k=0;k<oh.length;k++) { h = (oh[k]>h)?oh[k]:h;}
			// Extend shorter elements
			for (j=0;j<div.childNodes.length;j++) { c = div.childNodes[j]; if (c.nodeName=='DIV') { c.style.height = h+'px'; }}
			// Set the height of the containing element
			div.style.height = h+'px';
			}
		}
	}
window.onload = SI_clearAbsolutes;




/* OPACITY SHIFT */
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 == 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);
	
	//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)
}