Javascript Validation Functions

 function valAlpha() {
            if (event.keyCode >= 97 && event.keyCode <= 122 || event.keyCode >= 65 && event.keyCode <= 90 || event.keyCode == 32) event.returnValue = true;
            else
                event.returnValue = false;
        }
        function valNum() {
            if ((event.keyCode == 45 || event.keyCode == 48 || event.keyCode == 49 || event.keyCode == 50 || event.keyCode == 51 || event.keyCode == 52 || event.keyCode == 53 || event.keyCode == 54 || event.keyCode == 55 || event.keyCode == 56 || event.keyCode == 57)) event.returnValue = true;
            else
                event.returnValue = false;
        }
        function valDate() {
            if ((event.keyCode == 48 || event.keyCode == 49 || event.keyCode == 50 || event.keyCode == 51 || event.keyCode == 52 || event.keyCode == 53 || event.keyCode == 54 || event.keyCode == 55 || event.keyCode == 56 || event.keyCode == 57 || event.keyCode == 47)) event.returnValue = true;
            else
                event.returnValue = false;
        }
        function valDecimal() {
            if ((event.keyCode == 48 || event.keyCode == 49 || event.keyCode == 50 || event.keyCode == 51 || event.keyCode == 52 || event.keyCode == 53 || event.keyCode == 54 || event.keyCode == 55 || event.keyCode == 56 || event.keyCode == 57 || event.keyCode == 46)) event.returnValue = true;
            else
                event.returnValue = false;
        }