var newWin = null; 
function popUp(strURL, strType, strHeight, strWidth) { 
 if (newWin != null && !newWin.closed) 
   newWin.close(); 
 var strOptions=""; 
 if (strType=="console") 
   strOptions="resizable,height="+ 
     strHeight+",width="+strWidth; 
 if (strType=="fixed") 
   strOptions="status,height="+ 
     strHeight+",width="+strWidth; 
 if (strType=="elastic") 
   strOptions="toolbar,menubar,scrollbars,"+ 
     "resizable,location,height="+ 
     strHeight+",width="+strWidth; 
 newWin = window.open(strURL, 'newWin', strOptions); 
 newWin.focus(); 
}

// http://www.sitepoint.com/article/perfect-pop-up

// <a href="my-pop-up-window.htm"  onclick="popUp(this.href,'console',400,200);return false;"  target="_blank">This is my link</a>