
1. Here's the script that goes in the <head></head> tags:


<SCRIPT LANGUAGE="JavaScript">
<!--Hide from old browsers

function checkState(form){
var selectIndex;
var CountryValue;
var fullCountry;

for(i = 0; i < form.elements.length -1; i++){
     if(form.elements[i].name == "22_destCountry"){
          selectIndex = form.elements[i].selectedIndex;
          CountryValue = form.elements[i].options[selectIndex].value;
          fullCountry = form.elements[i].options[selectIndex].text;
     }
     if(form.elements[i].name == "12-M-STATE"){
          var stateValue = form.elements[i].value;
          if((CountryValue == "US")&&(stateValue == "")){
            alert("\nSince you selected " + fullCountry + " for your country, you" +
                  "\nmust enter your state abbreviation before going to checkout.\n");
            form.elements[i].focus();
            return false;
          }
     }
}
return true;
}
// End hiding -->
</SCRIPT>

2. Here's the event trigger tag:

<FORM ACTION="%%secure_script_url%%" METHOD="POST" TARGET="_top" onSubmit="return checkState(this);">