function ValidateForm(fm) {

    if (document.forms[fm].txtMinPrice.value == "" || isNaN(document.forms[fm].txtMinPrice.value)) {
        alert("Minimum costs must be a number");
        document.forms[fm].txtMinPrice.focus();
        return false;
    }
    if (document.forms[fm].txtMaxPrice.value == "" || isNaN(document.forms[fm].txtMaxPrice.value)) {
        alert("Maximum costs must be a number");
        document.forms[fm].txtMaxPrice.focus();
        return false;
    }
    return true;
}