function openFixedWindow( url, width, height, left, top, winname ) {
	var trails = "width=" + width + ",height=" + height + ",left=" + left +",top=" + top +",toolbar=no,directories=no,status=no,scrollbars=no,resizable=no,menubar=no,location=no";
	newWindow = window.open( url, winname, trails);
}

function openPlainWindow( url, width, height, left, top, winname ) {
	var trails = "width=" + width + ",height=" + height + ",left=" + left +",top=" + top +",toolbar=no,directories=no,status=no,scrollbars=yes,resizable=yes,menubar=no,location=no";
	newWindow = window.open( url, winname, trails);
}

function roll_over(img_name, img_src)
   {
   document[img_name].src = img_src;
   }