var nav4 = window.Event ? true : false;

function dropCr(e) {
  	if (nav4) // Navigator 4.0x
    		var whichCode = e.which
 	 else // Internet Explorer 4.0x
    		if (e.type == "keypress") // the user entered a character
      			var whichCode = e.keyCode
    		else
      			var whichCode = e.button;
  	if (e.type == "keypress")
	{	if (whichCode == 13) return false;
	}
	return true;
}

function dropCrPlus(e, txtfield, remfield, fldlimit) {
  	if (nav4) // Navigator 4.0x
    		var whichCode = e.which
 	 else // Internet Explorer 4.0x
    		if (e.type == "keypress") // the user entered a character
      			var whichCode = e.keyCode
    		else
      			var whichCode = e.button;
  	if (e.type == "keypress")
	{	if (whichCode == 13) return false;
		else
			if (txtfield.value.length > fldlimit) // if too long...trim it!
			txtfield.value = txtfield.value.substring(0, fldlimit);
			// otherwise, update 'characters left' counter
			else
			remfield.value = fldlimit - txtfield.value.length;
	}
	return true;
}