// Verify input

function checkRequiredFields(input)
{
    var requiredFields = new Array("username",
                                   "password");

    // TEXT TO DISPLAY THAT DESCRIBES THE MISSING FIELD(S) TO THE USER
    var fieldNames = new Array("Username",
						   "Password");

    var fieldCheck   = true;
    var fieldsNeeded = "\nA value must be entered in the following field(s):\n\n\t";

    for(var fieldNum=0; fieldNum < requiredFields.length; fieldNum++) {
        if ((input.elements[requiredFields[fieldNum]].value == " ") ||
            (input.elements[requiredFields[fieldNum]].value == "")) {

            fieldsNeeded += fieldNames[fieldNum] + "\n\t";
            fieldCheck = false;
        }
    }

    // ALL REQUIRED FIELDS HAVE BEEN ENTERED
    if (fieldCheck == true)
    {
		return true;
    }
    // SOME REQUIRED FIELDS ARE MISSING VALUES

	else
    {
        alert(fieldsNeeded);
        return false;
    }
}