function openpopup(pstrpage) {
var pstrURL, pinttop, pintleft;
pstrURL="apm_"+pstrpage+".htm";
pinttop = (screen.availHeight/2-170);
pintleft = (screen.availWidth/2-270);
if (navigator.appName == 'Microsoft Internet Explorer') 
	{window.open(pstrURL,pstrpage, "directories=no, location=no, menubar=no, resizable=yes, scrollbars=yes, status=no, toolbar=no, height=340, width=540,top="+pinttop+",left="+pintleft);}
else
	{popupwindow=window.open(pstrURL,pstrpage,'resizable,scrollbars,height=340,width=540');}
}