function checkEnter(e,fmname){ //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[fmname].submit(); //submit the form
		return false;
	} else { 
		return true; 
	}
}