var popupWindow=false;function showPopup(popupUrl,popupName,popupWidth,popupHeight,features){if(popupWindow&&popupWindow.closed==false)
popupWindow.close();if(typeof(features)!='undefined'&&features!=null&&features.length>0){features=','+features;}else{features='';}
popupWidth=(screen.availWidth<popupWidth?screen.availWidth:popupWidth);popupHeight=(screen.availHeight<popupHeight?screen.availHeight:popupHeight);var l=parseInt((screen.availWidth-popupWidth)/2);var t=parseInt((screen.availHeight-popupHeight)/2);popupWindow=window.open(popupUrl,popupName,"width="+popupWidth+",height="+popupHeight+",left="+l+",top="+t+features);popupWindow.focus();return false;}