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; 
					} 
				} 
		} 
	}