Drop down web script needed?

Drop down web script needed?

I want a page on my website where people can choose from a drop down list a product, and then an amount, and that will return a predetermined price and description.

Do you know how I can do this or do something similar?

Something like this:

htmlheadtitlestuff/title
style type=text/css
select{border:solid 1px #cccccc}
select:focus{border:solid 1px blue;}
#info, #drp{margin:10px 100px 10px 100px;padding:20px;border:solid 1px #cccccc;}
h3{color:red;}
/style
script type=text/javascript
function alertselected(selectobj){
if(selectobj.selectedIndex == 0){
var info = h3Select Diamonds/h3 \
pValue: 37,000.00 Euro/p;
}
if(selectobj.selectedIndex == 1){
var info = h3Computer Network Installations/h3 \
pValue: 245,000.00 Euro/p;
}
if(selectobj.selectedIndex == 2){
var info = h3Collection of Classic Sports Cars/h3 \
pValue: 95,000,000.00 Euro/p;
}
document.getElementById('i').innerHTML = info;
}
/script
/headbody
div id='drp'
h1Select Product/h1
pPlease use the menu below to select the product you are interested in/p
form id=someform
select id=sample onChange=alertselected(this)
optionDiamonds/option
optionComputers/option
optionCars/option
/select
/form
/div
div id='info'
h2Information on your product/h2
span id='i'pNo product selected/p/span
/div
/body/html