function unFormatNumber(string) {

    if(string==''){
		return '';
	}

    var sTmp = ""; 
	var sValid = ","; 

	for (var i=0; i< string.length; i++) 
	{ 
		if (sValid.indexOf(string.charAt(i)) == -1) sTmp += string.charAt(i); 
	} 
	return sTmp;		
}