// REMOVE ALL NON-NUMERIC CHARACTERS
function toNumeric(checkString)
{
    newString = "";    // REVISED/CORRECTED STRING
    // LOOP THROUGH STRING CHARACTER BY CHARACTER
    for (i = 0; i < checkString.length; i++) {
        // REMOVE NON-NUMERIC CHARACTERS
        if (checkString.charAt(i) >= "0" && checkString.charAt(i) <= "9") {
            newString += checkString.charAt(i);
        }
       }
    return newString;
}