Form addition and multiplication

<i><b>Originally posted by : Henry (henry@consulting-henry.com)</b></i><br />I am putting together a form that features about 50 items<br />each has a definition a $ value a quantity <br />then a sub-total and a grand total<br />something like<br />item 1 ; value $5; quantity:2 sub-total $10<br />item 2; value $12; qty:0 sub ttl $0<br />item 3; value $2; qty:3 sub-ttl $6<br /> <br />grand total : $16<br /><br />what will be a simple way to write such a code knowing that <br />I want the code to pick up only items ordered<br /><br />them how will I pass the info to confirm<br />thanks<br />