function DisableButton(buttonName, buttonText)
{
	var isValidation = (window.ValidatorOnSubmit!=null); 
	if(!isValidation || window.event.returnValue==true)
	{
		var button=document.getElementsByName(buttonName)[0];
		if (button)
		{
			if (buttonText!='') button.value=buttonText;
			setTimeout("document.getElementsByName('" + buttonName + "')[0].disabled=true;", 50);
		}
	}
	return true;
}