Putt dette mellom HEAD_taggene (eller legg det i en .js-fil):

<SCRIPT LANGUAGE="javascript">
PreviewText="Klikk på bildet for å forstørre det";
NewWindowTitle="Stort bilde";
ClickToCloseText="Klikk på bildet for å lukke vinduet";
function showImg(imageURL, showThisSize, width, height)
{
newHeight=Math.round(height*showThisSize/width);
document.write("<A HREF=\"javascript:showRealSize('"+imageURL+"', "+width+", "+height+");\"><IMG SRC='"+imageURL+"' WIDTH='"+showThisSize+"' HEIGHT='"+newHeight+"' BORDER='0' ALT='"+PreviewText+"'></A>")
}
function showRealSize(imageURL, width, height)
{
NewImageWindow=window.open("", Math.round(Math.random()*10000000000), "width="+width+",height="+height);
NewImageWindow.document.open();
NewImageWindow.document.write("<HTML><HEAD>");
NewImageWindow.document.write("<TITLE>"+NewWindowTitle+"</TITLE>");
NewImageWindow.document.write("</HEAD>");
NewImageWindow.document.write("<BODY MARGINHEIGHT='0' TOPMARGIN='0' LEFTMARGIN='0' RIGHTMARGIN='0' MARGINWIDTH='0'>");
NewImageWindow.document.write("<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0><TR><TD><A HREF='javascript:top.close();'><IMG SRC='"+imageURL+"' WIDTH='"+width+"' HEIGHT='"+height+"' ALT='"+ClickToCloseText+"' BORDER='0' HSPACE=0 VSPACE=0></A></TD></TR></TABLE>");
NewImageWindow.document.write("</BODY></HTML>");
}
//-->
</SCRIPT>