function MM_openBrWindowNew(theURL,winName,features, myWidth, myHeight, isCenter) { //v3.0
       if(window.screen)if(isCenter)if(isCenter=="true"){
         var myLeft = (screen.width-myWidth)/2;
         var myTop = (screen.height-myHeight)/2;
         features+=(features!='')?',':'';
         features+=',left='+myLeft+',top='+myTop;
       }
       ventana = window.open(theURL,winName,features+((features!='')?',':'')+'width='+myWidth+',height='+myHeight);
    }