var loc = 'left.htm'; 
var h = '600'; 
var w = '200'; 
function newWindow() { 
  var day = new Date(); 
 var id= day.getTime(); 
 var params = 'width='+w+',height='+h+',resizable'; 
 var win=open(loc,id,params); 
 return false; 
} 
document.write('<a href="'+loc+'" onClick="return newWindow();">Sites<\/a>');