var __defaultFired = false; 
var __nonMSDOMBrowser = (window.navigator.appName.toLowerCase().indexOf("explorer") == -1);  
function WebForm_FireDefaultButton(event, target) {    
    var event_element = event.target? event.target : event.srcElement; 
	if (!__defaultFired && event.keyCode == 13 && !(event_element && (event_element.tagName.toLowerCase() == "textarea"))) { 
		var defaultButton; 
		if (__nonMSDOMBrowser) { 
			defaultButton = document.getElementById(target); 
		} 
		else { 
			defaultButton = document.all[target]; 
		}                           
		if (defaultButton && typeof(defaultButton.click) != "undefined") {  
			__defaultFired = true;                                                            
			defaultButton.click(); 
			event.cancelBubble = true; 
			if (event.stopPropagation) event.stopPropagation(); 
			return false; 
		} 
		else if(typeof(defaultButton.click) == "undefined"){ 
			var clickevent=document.createEvent("MouseEvents") 
			clickevent.initEvent("click", true, true)                                                                                      
			__defaultFired = true;                                                            
			defaultButton.dispatchEvent(clickevent) 
			event.cancelBubble = true; 
			if (event.stopPropagation) event.stopPropagation(); 
			return false;                    
		} 
	} 
	return true; 
}