validating IncNum

ie:

function checkIncNumKeyUp(e) {
    var e = window.event || e;
    var str = document.getElementById("arid1000000161").value.toString();
    var reg = /^INC\d*$/;
    var myStyle = document.getElementById("arid1000000161").style;
    F(1000000161).S(str.toUpperCase());
    if ((e.ctrlKey) && (e.keyCode == 86)) {
        var afterReplace = str.replace(/\s/ig, "");
        F(1000000161).S(afterReplace);
    }
    if (str.length > 20) {
        F(1000000161).S(afterReplace.substring(0, 20));
    }
    if (str.length > 0) {
        if (!reg.test(document.getElementById("arid1000000161").value)) {
            document.getElementById("arid1000000161").style.border = '1px solid #ff0016';
        } else {
            myStyle.borderBottomColor = "#BBC4C9";
            myStyle.borderLeftColor = "#6B7479";
            myStyle.borderRightColor = "#BBC4C9";
            myStyle.borderTopColor = "#6B7479";
        }
    }
}

ff:

function checkIncNumKeyDown(e) {
    var e = window.event || e;
    return ((e.keyCode > 47) && (e.keyCode < 58) ||  

(e.keyCode == 8) || (e.keyCode == 73) || (e.keyCode == 78) || (e.keyCode == 67) || 

(e.keyCode > 95) && (e.keyCode < 106) || (e.ctrlKey) && 

(e.keyCode == 67) || (e.ctrlKey) && (e.keyCode == 86) ||  

(e.keyCode == 37) || (e.keyCode == 39));
} 

function checkIncNumKeyUp(e) {
    var str = document.getElementById("arid1000000161").value.toString();
    var reg = /^INC\d*$/;
    var myStyle = document.getElementById("arid1000000161").style;
    F(1000000161).S(str.toUpperCase());
    if ((e.ctrlKey) && (e.keyCode == 86)) {
        F(1000000161).S(F(1000000161).G().toString().replace(/\s/g, ""));
    }
    if (str.length > 0) {
        if (!reg.test(document.getElementById("arid1000000161").value)) {
            document.getElementById("arid1000000161").style.border = '1px solid #ff0016';
        } else {
            myStyle.borderBottomColor = "#BBC4C9";
            myStyle.borderLeftColor = "#6B7479";
            myStyle.borderRightColor = "#BBC4C9";
            myStyle.borderTopColor = "#6B7479";
        }
    }
}