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.forms[0].submit() //submit the form
		return false
	} else {
		return true
	}
}