var windows = new Array();

function createNewWin(sUrl,target,barsDescription) {
 var i; 

 for ( i=0 ; i < windows.length ; i++) {
   if(windows[i]!=null && !windows[i].closed && windows[i].parent.name==target) {
    windows[i].focus();
    return;
   }	
 } 
 windows[i] = window.open(sUrl,target,barsDescription);
}