function WebForm_FireDefaultButton(event, target) {
        var element = event.target || event.srcElement; 
        if (event.keyCode == 13 && !(element && (element.tagName.toLowerCase() == "textarea"))) {   
        
            var defaultButton = document.getElementById(target);  
            if(defaultButton && typeof(defaultButton.click) == 'undefined') 
            {
                defaultButton.onclick();
            }
            else
            {
                defaultButton.click();
            }            
            event.cancelBubble = true;
            if (event.stopPropagation) event.stopPropagation();
            return false;
        }
        else
        {
        return true;
        }
        return true;
    }