window.onload = initImages;

function initImages() {
	for (var i=0; i<document.images.length; i++) {

	document.images[i].ondblclick = newWindow;

	}
}

function newWindow() {
	var imgName = this.id + ".jpg"
	var imgWindow = window.open(imgName,"imgWin", "width=640, height=480,scrollbars=no")
}