function pop_radio (a) {
   
   if (a == 3 && document.search.name.value == "")
   {
     alert("You must enter a name before supplying a birthdate.")
     document.search.name.focus()
     document.search.bmonth.selectedIndex = 0
     document.search.bday.selectedIndex = 0
     document.search.byear.value = "Year"
     a = 1
   }

   document.search.search_type.value = a;
     if (a == 1) {
       n = document.search.name.length;
       field = name;
       document.search.hmonth.options.selectedIndex = 0;
       document.search.hday.options.selectedIndex = 0;
       document.search.hyear.value = "Year";
       document.search.casenum.value = "";
       document.search.ticknum.value = "";
     } else if (a == 3) {
       n = document.search.bmonth.length;
       field = document.search.bmonth;
       document.search.hmonth.options.selectedIndex = 0;
       document.search.hday.options.selectedIndex = 0;
       document.search.hyear.value = "Year";
       document.search.casenum.value = "";
       document.search.ticknum.value = "";
     } else if (a == 4) {
       n = document.search.hmonth.length;
       field = document.search.hmonth;
       document.search.name.value = "";
       document.search.bmonth.options.selectedIndex = 0;
       document.search.bday.options.selectedIndex = 0;
       document.search.byear.value = "Year";
       document.search.casenum.value = "";
       document.search.ticknum.value = "";
     } else if (a == 5) {
       n = document.search.ticknum.value;
       field = document.search.ticknum;
       document.search.name.value = "";
       document.search.bmonth.options.selectedIndex = 0;
       document.search.bday.options.selectedIndex = 0;
       document.search.byear.value = "Year";
       document.search.hmonth.options.selectedIndex = 0;
       document.search.hday.options.selectedIndex = 0;
       document.search.hyear.value = "Year";
       document.search.casenum.value = "";
     } else if (a == 8) {
       n = document.search.casenum.value;
       field = document.search.casenum;
       document.search.name.value = "";
       document.search.bmonth.options.selectedIndex = 0;
       document.search.bday.options.selectedIndex = 0;
       document.search.byear.value = "Year";
       document.search.hmonth.options.selectedIndex = 0;
       document.search.hday.options.selectedIndex = 0;
       document.search.hyear.value = "Year";
       document.search.ticknum.value = "";
     }
 }