/*
	specific function for changing the opacity of certain layers in the SVDB portfolio index
*/
function appointOpacity(itemId) {
	
	/* first, get the transparant overlay */
	var theDoppelganger = document.getElementById('thumb-'+itemId);
	theDoppelganger.className = 'port_item_thumb hide';
	
}
function returnOpacity(itemId) {
	
	/* first, get the transparant overlay */	
	var theDoppelganger = document.getElementById('thumb-'+itemId);
	theDoppelganger.className = 'port_item_thumb show';
	
}

/*
	Simple hide/unhide div script
*/

function doDiv(action, id)
{
	if (action == 'show')
	{
	document.getElementById("explanation"+id).style.display = "block";
	document.getElementById("link"+id).href= "javascript:doDiv('hide', "+id+")";
	
		if(id == 1){
			document.getElementById("explanation2").style.display = "none";
			document.getElementById("link2").href= "javascript:doDiv('show', 2)";
		}else if(id == 2){
			document.getElementById("explanation1").style.display = "none";
			document.getElementById("link1").href= "javascript:doDiv('show', 1)";
		}
	
	}

	if (action == 'hide')
	{
	document.getElementById("explanation"+id).style.display = "none";
	document.getElementById("link"+id).href= "javascript:doDiv('show', "+id+")";
	}
}


/*
	Standards Compliant Rollover Script
	Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
*/
function initRollovers() {
	if (!document.getElementById) return

	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {
		if (aImages[i].className == 'imgover') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);

			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;

			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}

			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

window.onload = initRollovers;