How do I call this js?

Greetings all,

A former employee put this js file together but I could not find out it is being called.

Can you please help?

Here is a snippet of the code and how I am trying to call it.


function validateField( fld, flags, name )
{
    // alert("validate(" + fld.value + "," + flags + "," + name + ")");
    var ftype = flags.charAt(0).toUpperCase();
    var numat = 1;
    var zeroOk = false;
    var minSize = 0;
    var maxSize = 255;
    if ( flags.charAt(1).toUpperCase() == "Z" )
    {
        zeroOK = true;
        numat = 2;
    }
    if ( flags.length > numat )
    {
        var nums = flags.substring(numat).split(/\_/);
        minSize = parseInt(nums[0]);
        if ( nums.length > 1 ) maxSize = parseInt(nums[1]);
    }
    // okay, ready for anthing...he says
    var fval = null;
    switch ( ftype )
    {
        case "C":
            fval = validateCurrency(fld);
            if ( fval == null ) return name + " is not a valid currency value";
            if ( fval == 0 && ! zeroOk ) return name + " can not be zero";
            if ( fval < minSize || fval > maxSize)
                return name + " must be between " + minSize + " and " + maxSize;
            return "";
        case "D":
            fval = validateDate(fld);
            if ( fval == null ) return name + " is not a valid date of the form mm/dd/yyyy";
            return "";
        case "E":
            fval = validateEmail(fld);
            if ( fval == null ) return name + " is not a valid email address";
            return "";
        case "F":
            fval = validateFloat(fld);
            if ( fval == null ) return name + " is not a valid decimal value";
            if ( fval == 0 && ! zeroOk ) return name + " can not be zero";
            if ( fval < minSize || fval > maxSize)
                return name + " must be between " + minSize + " and " + maxSize;
            return "";
        case "I": case "N":
            fval = validateInteger(fld);
            if ( fval == null ) return name + " is not a valid numeric value";
            if ( fval == 0 && ! zeroOk ) return name + " can not be zero";
            if ( fval < minSize || fval > maxSize)
                return name + " must be between " + minSize + " and " + maxSize;
            if ( ftype == "I" && fval < 0 ) return name + " cannot be negative";
            return "";
        case "P":
            fval = validatePhone(fld);
            if ( fval == null ) return name + " is not a valid 10 or 11 digit phone number";
            return "";
        case "S":
            fval = fld.value.replace(/^\s+/,"").replace(/\s+$/,""); // trim()
            fld.value = fval;
            if ( fval < minSize || fval > maxSize)
                return name + " must have between " + minSize + " and " + maxSize + " characters";
            return "";
        case "T":
            fval = validateTime(fld);
            if ( fval == null ) return name + " is not a valid time of the form hh:mm:ss";
            return "";
        case "R":
            var rre = new RegExp(flags.substring(1));
            if ( ! rre.test(val) ) return name + " does not match required pattern";
            return "";
        case "X": case "*":
            var cbs = fld.form.elements[ fld.name ];
            if ( cbs.length == null )
            {
                // single checkbox...so it can only be optional or not
                if ( ! cbs.checked && minSize > 0 ) return "You must check in checkbox " + name;
                return "";
            }
            if ( cbs[0] != fld ) return "#"; // special flag: not first checkbox of set
            var cnt = 0;
            for ( c = 0; c < cbs.length; ++c )
            {
                if ( cbs[c].checked ) ++cnt;
            }
            if ( cnt < minSize || cnt > maxSize )
            {
                return "You must check " + minSize + " to " + maxSize + " " + name + " checkboxes";
            }
            return "";
        default:
            return "\n*** ERROR: Invalid type flag, " + ftype + "\n";
    }
}

function validateDate(fld)
{
    var dateRE = /^(0?[1-9|1[012])\-(0?[1-9]|[12]\d|3[01])\-(19|20)\d\d$/
    //    var dateRE = /^\d\d?\-\d\d?\-(19|20)\d\d$/

    var val = fld.value.replace(/[\s\/\.]/g,"-");
    val = val.replace(/[^\d\-]/g,"");
    val = val.replace(/\-+/g,"-");
    if ( ! dateRE.test(val) ) return null;
    var pcs = val.split(/\-/);
    if ( pcs.length != 3 ) return null;
    var mn = parseInt(pcs[0])-1;
    var dt = new Date( parseInt(pcs[2]), mn, parseInt(pcs[1]) );
    if ( mn != dt.getMonth() ) return null;
    fld.value = val;
    return val;
}


THen I would like to use the above to ensure date field is not blank.

<input type=text name=sentDate value="">

How do I use the js with the above input box?

Thanks a million