function setchangepic(){
	var linkArr = getElementsByClassName('changepict','');
	for(var i  = 0; i < linkArr.length; i++) {
		linkArr[i].onmouseover = changepic;
		linkArr[i].onclick = opongal;
		}
	}

function changepic(){
	var src = this.href;
	var oDIV = document.getElementById('mainimage');
	src = src.replace(/b(\d)+.jpg/,'$1.jpg');
	oDIV.style.backgroundImage = "url('"+src+"')";
	}
function opongal(){
	var req = this.rel;
	showHTMLwindow(req,430,400,1);
	return false;
	}