//window.onload = thumboverInit;

function thumboverInit() {
        
	var target=document.getElementById("myPicture");
	var thumbs=document.getElementById("thumbs").getElementsByTagName("IMG");
	
	for (var i=0; i<thumbs.length; i++) {

		var imageobj=thumbs[i];
		
		if (target && imageobj){
			//alert ("hello");
		setupRollovert(imageobj,target);
		}
	}
}

function setupRollovert(thumb,image) {
	
	thumb.imgToChange = image;
	thumb.onmouseover = rollOvert;
	thumb.overImage = new Image();
	thumb.overImage.src = thumb.src.replace("_tn", "");
}


function rollOvert() {
    this.imgToChange.src = this.overImage.src;
}