function showPopup(url,awidth,aheight)
{
if(!awidth) awidth=600;
if(!aheight) aheight=600;
var awin=window.open(url,'doctor',"leftmargin=0, topmargin=0, rightmargin=0, bottommargin=0, toolbar=no, width="+awidth+", height="+aheight+", status=no, scrollbar=no, resize=no, menubar=no, screenX=200, screenY=0");
awin.focus()}