var newWin = null; 
function popUp(strURL, strType, strHeight, strWidth,name) { 
 if (newWin != null && !newWin.closed) 
   newWin.close(); 
 var strOptions=""; 

 if (strType=="console") 
   strOptions="resizable,scrollbars,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, name, strOptions); 
 newWin.focus(); 
}

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