// code that makes the gallery nav images work

var W3CDOM = (document.createElement && document.getElementsByTagName);

function init() {
	
	if (!W3CDOM) { return; }
	
	var x = document.getElementById('tab');
	if(!x) return;
	
	var y = x.getElementsByTagName('a');
	
	for (var i=0;i<y.length;i++) {
		y[i].onmouseover = rollover;
		y[i].onmouseout = rolloff;
		
	}
 }

function rollover() {

		whichpic = this;

		if ((whichpic.childNodes[0].className != "on")) {
			
			imgsrc = whichpic.childNodes[0].src;
			regex = /_off/;
			newimgsrc=imgsrc.replace(regex, "_on");
			
			whichpic.childNodes[0].src = newimgsrc;
		}
}

function rolloff() {
	
	whichpic = this;
	
	if ((whichpic.childNodes[0].className != "on")) {

			imgsrc = whichpic.childNodes[0].src
			regex = /_on/;
			newimgsrc=imgsrc.replace(regex, "_off");
			
			whichpic.childNodes[0].src = newimgsrc;
	}	
} 
 
window.onload=init;