function IsNumeric(strString)
    {    	
		var strValidChars = "0123456789";
		var strChar;
		var blnResult = true;

		if (strString.length == 0) return false;

		for (i = 0; i < strString.length && blnResult == true; i++)
		{ 
			strChar = strString.charAt(i);
			if (strValidChars.indexOf(strChar) == -1)
			{
				blnResult = false;
			}
		}
		return blnResult;
	}
	
	function trim(txt)	
	{ 			
		while (txt.substring(0,1) == ' ') {
		    txt = txt.substring(1, txt.length);
		}
		while (txt.substring(txt.length-1,txt.length) == ' ') {
		    txt = txt.substring(0, txt.length-1);
		}	return txt;
	}