If Statement help

[Joan Leon]

I need help (I'm a newby and just learning Javascript). I need an if statement for my required Address Fields that would only be required when "Other Address" radio button is selected.

    var x=document.forms["myForm"]["Addr0"].value
    if (x==null || x=="")
  {
      alert("No/Street must be filled out");
      return false;
  }
    var x=document.forms["myForm"]["Addr1"].value
    if (x==null || x=="")
  {
      alert("Suburb must be filled out");
      return false;
  }
    var x=document.forms["myForm"]["Addr2"].value
    if (x==null || x=="")
  {
      alert("Please Select a State");
      return false; 
  }
    var x=document.forms["myForm"]["Addr3"].value
    if (x==null || x=="")
  {
      alert("Post Code must be filled out");
      return false;
  }
<div id="radBtnCont">
           Home Address: <input type="radio" name="radBtn" value="home" />
            Other Address:<input type="radio" name="radBtn" value="other" /><br /><br />
 
   </div>
        <div id="addressCont">
 
<I><B>If Other Address:</I></B><br /><br />
 
          No/Street:  <input type="text" name="Addr0" />
 
     Suburb: <input type="text" name="Addr1" /><br /><br />
 
    State: <select name="Addr2">
                <option> Please Select
    <option value="act">ACT</option>
    <option value="nt">NT</option>
                <option value="nsw">NSW</option>
    <option value="qld" >QLD</option>
    <option value="sa">SA</option>
    <option value="tas">TAS</option>
                <option value="wa">WA</option></select>
 
    Post Code:<input type="text" name="Addr3" /><br />
               </div><br /><br />

Thanks Joan.

[Dormilich]

in pseudo code

// I abbreviated HTML elements by <element_description>
if (<other address radio>.checked && !<other address text field>.value)
    error()

PS. (x==null || x=="") is redundant, because a form element’s value is never null and you make a non-typesafe comparison (i.e. x==null fires also when x is false, 0, "" or undefined)