function checkentry()
{
        var returnvalue = false;
        if (document.entry.productcode.value == "")
        {
                alert("Please enter a Product Number");
        }
        else if (isNaN(document.entry.quantity.value) == true || document.entry.quantity.value == "0" || document.entry.quantity.value == "")
        {
                alert("Please enter a numerical non-zero value");
        }
        else
        {
                returnvalue = true;
        }
        return returnvalue;
}
function check2()
{
        var returnvalue = false;
        if (document.form2.prodsearchvalue.value == "")
        {
                alert("Please enter a Search String");
        }
        else
        {
                returnvalue = true;
        }
        return returnvalue;
}
function check3()
{
        var returnvalue = false;
        if (isNaN(document.form3.quantity.value) == true || document.form3.quantity.value == "0" || document.form3.quantity.value == "")
        {
                alert("Please enter a numerical non-zero value");
        }
        else
        {
                returnvalue = true;
        }
        return returnvalue;
}