<html> <head> <script language="javascript" type="text/javascript"> function SubmitIt(carForm) { doorOption = -1 if (carForm.DoorCt[doorOption].value == "fourDoor" && carForm.sunroof.checked) { alert("The sunroof is only available on the two door model") return false } return true } function doorSet(sunroofField) { if (sunroofField.checked) { for (i=0; i<document.myForm.DoorCt.length; i++) { if (document.myForm.DoorCt[i].value == "twoDoor") { document.myForm.DoorCt[i].checked = true } } } } </script> </head> <body> <h2> Car Picker<p> <form onSubmit="return SubmitIt(this)" action="ok.asp" name="myForm"> Doors: <br> <input type="CHECKBOX" name="sunroof" value="YES" onClick="doorSet(this)">Sunroof(two door only) <br><br> <input type="radio" value="twoDoor" name="DoorCt">two <input type="radio" value="fourDoor" name="DoorCt">Four <br> <input type="Submit" value="Submit"> </form></h2> </body> </html>