document.onkeydown = function() {
     return checkEnter(event)
};


function DoLogin() {
	document.getElementById('LoginSub').value = "1";
	document.form1.submit();
}

function checkEnter(e){ //e is event object passed from function invocation
	var characterCode; //literal character code will be stored in this variable

	if(e && e.which){ //if which property of event object is supported (NN4)
		e = e
		characterCode = e.which //character code is contained in NN4's which property
	} else {
		e = event
		characterCode = e.keyCode //character code is contained in IE's keyCode property
	}

	if(characterCode == 13){ //if generated character code is equal to ascii 13 (if enter key)
		document.form1.submit() //submit the form
		return false 
	} else {
		return true 
	}

}