function CreateWindow(first) { 

 var newWin = window.open('','newWin', 'toolbar=no,width=780,height=550,top=10, left=50,directories=no,status=yes,scrollbars=yes,resizable=yes,menubar=no')

    if (navigator.appVersion.indexOf("(X11") != -1 ||
        navigator.appVersion.indexOf("(Mac") != -1)
    
      newWin = window.open('','newWin', 'toolbar=yes,width=780, height=550, top=10, left=50,directories=no,status=yes,scrollbars=yes,resizable=yes,menubar=no')
{
 newWin.location.href = first;
}
 newWin.focus();
} 
<!--//
function CreateWindow(first) { 
var newWin = window.open('','newWin', 'toolbar=no,width=780,height=550,top=10, left=50,directories=no,status=yes,scrollbars=yes,resizable=yes,menubar=no')
if (navigator.appVersion.indexOf("(X11") != -1 ||
navigator.appVersion.indexOf("(Mac") != -1)
newWin = window.open('','newWin', 'toolbar=yes,width=780, height=550, top=10, left=50,directories=no,status=yes,scrollbars=yes,resizable=yes,menubar=no')
{newWin.location.href = first;}
newWin.focus();}
//-->