function openwindow (file, width, height) {
	var left = parseInt((screen.availWidth/2)-(width/2));
	var top = parseInt((screen.availheight/2)-(height/2));
	var windowfeats = 'resize,scrollbars=auto,left='+left+',top='+top+',width='+width+',height='+height;
	var mypopup = window.open('images/artwork/'+file, 'newwindow', windowfeats);
	mypopup.resizeTo((width+10), (height+60));
	mypopup.focus();
}