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;}}}}