// verifies only a number was typed into the form element
    function numbersonly(e){
        var unicode=e.charCode? e.charCode : e.keyCode
        // if (unicode!=8||unicode!=9)
        if (unicode<8||unicode>9)
            {
            //if the key isn't the backspace key or tab key (which we 
should
allow)
            if (unicode<48||unicode>57) //if not a number
            return false //disable key press
        }
    }