calculate on change

[jwk811]

im going to have a select box and when someone choses a different number i want right next to it but out of the box to calculate the total depending on what they chose.. could someone give me a brief insruction on how i could go about doing this? Thank you very much for any help i can get.. im not very good with javascript

[artacus]

You need an onchange for your select box and a span or div beside it where the results will appear
<span id='myResults'></span><select onChange='recalc(this);'>...

and in the head portion of your doc add this function:
function recalc(selObj) {
  var myVal = selObj.options[selObj.selectedIndex].value;
  document.getElementById('myResults').innerHTML = myVal * 1.5;
  //whatever you need to calculate here
}