function compute(f){
if (isNaN(Number(f.M1_qty.value))){
f.qty1.value='0';
}
else if (isNaN(Number(f.M1_price.value))){
f.cost1.value='0';
}
var sub = ((f.M1_qty.value*f.M1_price.value)
+(f.M2_qty.value*f.M2_price.value)
+(f.M3_qty.value*f.M3_price.value)
+(f.M4_qty.value*f.M4_price.value)
+(f.M5_qty.value*f.M5_price.value)
+(f.M6_qty.value*f.M6_price.value)
//+(f.M7_qty.value*f.M7_price.value)
//+(f.M8_qty.value*f.M8_price.value)
+(f.S1_qty.value*f.S1_price.value)
+(f.S2_qty.value*f.S2_price.value)
+(f.S3_qty.value*f.S3_price.value)
+(f.S4_qty.value*f.S4_price.value)
+(f.Misc1_qty.value*f.Misc1_price.value)
+(f.Misc2_qty.value*f.Misc2_price.value)
+(f.Misc3_qty.value*f.Misc3_price.value)
+(f.Misc4_qty.value*f.Misc4_price.value)
+(f.Misc5_qty.value*f.Misc5_price.value)
+(f.Misc6_qty.value*f.Misc6_price.value)
+(f.Misc7_qty.value*f.Misc7_price.value)
+(f.Misc8_qty.value*f.Misc8_price.value)
+(f.Misc9_qty.value*f.Misc9_price.value)
+(f.Misc10_qty.value*f.Misc10_price.value)
+(f.Misc11_qty.value*f.Misc11_price.value)
+(f.Misc12_qty.value*f.Misc12_price.value)
+(f.Misc13_qty.value*f.Misc13_price.value)
+(f.C1_qty.value*f.C1_price.value)
+(f.C2_qty.value*f.C2_price.value)
+(f.C3_qty.value*f.C3_price.value)
+(f.C4_qty.value*f.C4_price.value)
+(f.C5_qty.value*f.C5_price.value)
+(f.C6_qty.value*f.C6_price.value)
+(f.C7_qty.value*f.C7_price.value)
+(f.A1_qty.value*f.A1_price.value)
+(f.A2_qty.value*f.A2_price.value)
+(f.A3_qty.value*f.A3_price.value)
+(f.A4_qty.value*f.A4_price.value)
+(f.A5_qty.value*f.A5_price.value)
+(f.A6_qty.value*f.A5_price.value)
+(f.A7_qty.value*f.A7_price.value)
+(f.A8_qty.value*f.A8_price.value)
+(f.A9_qty.value*f.A9_price.value)
+(f.A10_qty.value*f.A10_price.value)
+(f.A11_qty.value*f.A11_price.value)
+(f.A12_qty.value*f.A12_price.value)
+(f.A13_qty.value*f.A13_price.value)
+(f.A14_qty.value*f.A14_price.value)
+(f.A15_qty.value*f.A15_price.value)
+(f.A16_qty.value*f.A16_price.value)
+(f.A17_qty.value*f.A17_price.value)
+(f.A18_qty.value*f.A18_price.value)
+(f.D1_qty.value*f.D1_price.value)
+(f.D2_qty.value*f.D2_price.value)
);
f.subtotal.value=sub.toFixed(2);
}
function validate_form ( )
{
valid = true;
if ( document.checkout.subtotal.value == "0.00" )
{
alert ( " Your cart is empty!.. \n\n Please select item/s to proceed next step." );
valid = false;
}
return valid;
}