if(!document.getElementById("radio1").checked
&& !document.getElementById("radio2").checked
&& !document.getElementById("radio3").checked
&& !document.getElementById("radio4").chacked) 
{
alert("Please select a contact");
}





<label><br>
            <input name="radio" type="radio" value="1" id="radio1"/>
            <strong>General Support, Billing</strong>            </label> 
            <br>
            <label>
              <input name="radio" type="radio" value="2" id="radio2"/>
              <strong>Eggdrop, PsyBnc, Tcl Admin </strong></label>
            <br>

            <label>
              <input name="radio" type="radio" value="3" id="radio3"/>
            <strong>Web Design Admin </strong><br>
            </label>
			 
			  <label>		  
              <input name="radio" type="radio" value="4" id="radio4"/>
              <strong>Technical Support Admin</strong></label>