function clickButton(e,buttonId)
{ 
  var bt = document.getElementById(buttonId);   
     if (typeof bt == 'object'){                 
           if(navigator.appName.indexOf("Netscape")>(-1)){ 
                 if (e.keyCode == 13){                 
                       bt.click();
                       return false; 
                 } 
           } 
           if (navigator.appName.indexOf("Microsoft Internet Explorer")>(-1)){                 
                 if (event.keyCode == 13){                  
                      bt.click();
                       return false; 
                 } 
           } 
     }

}