Upload four images at the same time.

Hi,

I have this code that upload just one image to my folder.
how can I have four image upload at the same time.

Here's what I have.


<cfif IsDefined('FORM.upload_button')>
      <!--- upload to current directory by default --->
      <cfset targetDirectory = ExpandPath('.')&"\LoadImages\">

      <cffile nameconflict="overwrite" action="upload"
              destination="#targetDirectory#"
             filefield="FORM.upload_file" />
   
      <cfset pathToFile = targetDirectory &"/"& CFFILE.serverFile>

        <cfoutput>
                  image #CFFILE.serverFile# <img src="LoadImages/#CFFILE.serverFile#">
            </cfoutput>

</cfif>

<form name="RTEDemo" action="PostAd.cfm?ChID=1" method="post" onSubmit="return submitForm();" enctype="multipart/form-data">

<input type="file" name="upload_file"/>
<input type="submit" name="upload_button" value="Upload"/>

</form>

I know that I have to add three more input type file but what should I name them?
exp:
<input type="file" name="upload_file1"/>
<input type="file" name="upload_file2"/>
<input type="file" name="upload_file3"/>
now that I have three different upload name I have to change my code?

Thanks,