how to validate radio button and drop down list using java script?

[impin]

Form:

<form name="newuserForm" action="register.php" method="post" onsubmit="return validateForm()";>
 
<label style="font-size:18px">Gender<br />
</label><label style="font-size:18px">Male </label><input id="male" type="radio" name="gender" class="box" style="border:solid 3px #333333" value="female" />
<label style="font-size:18px">أنثى</label><input id="female" type="radio" name="gender" value="female"><br /><br />
 

Java Script:

function validateForm()
{
if (document.getElementById("male").checked=false && document.getElementById("female").checked=false)
{
     alert("Please select Gender");
  return false;
}
}

its not working? how to do it? please help....

[Atli]

A single = is an assignment operator, while double == is a comparison operator. If you are checking whether two values match, you should use the double version.

// This is wrong. This will not check if it's false, it will
// set it to false and then return true.
if (value = false)
 
// This is how it should be.
if (value == false)
 
// Or, since this is a boolean check, you can also do this.
if (!value)