function ValidateNumberKeyPress(field, evt)
        {
            var charCode = (evt.which) ? evt.which : event.keyCode
            var keychar = String.fromCharCode(charCode);

            if (charCode > 31 && (charCode < 48 || charCode > 57)  )
            {
                return false;
            }

            if (keychar == "." && field.value.indexOf(".") != -1) 
            {
                return false;
            }
                
            if(keychar == "-")
            {
                if (field.value.indexOf("-") != -1 /* || field.value[0] == "-" */) 
                {
                    return false;
                }
                else
                {
                    //save caret position
                    var caretPos = getCaretPosition(field);
                    if(caretPos != 0)
                    {
                        return false;
                    }
                }
            }

            return true;
        }
        
function ValueControl(field)
{
    if(field.value == "")
    {
    field.value=0;
    }
}