cfif statement

I have a cfselect and when a user selects Vendor from the list, a div displays showing a company field to enter the company name. I am trying to get to the logic that checks if Vendor is selected, make the company field required`. Here is what i got so far.

When I fill out the form and choose vendor the div with the company field displays but I cannot make it required

Thank you!

<cfif form1.county EQ 'Vendor'>

                                <cfinput type="text" name="company" id="company" width="190" message="Please enter your company name." required="yes" >

                          <cfelse>

                           <cfinput type="text" name="company"  id="company" width="190" message="Please enter your company name." >

                           </cfif>