function changeDiv(responseDiv){
       var ajaxRequest;  // The variable that makes Ajax possible!

       try{
               // Opera 8.0+, Firefox, Safari
               ajaxRequest = new XMLHttpRequest();
       } catch (e){
               // Internet Explorer Browsers
               try{
                       ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
               } catch (e) {
                       try{
                               ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
                       } catch (e){
                               // Something went wrong
                               alert("Your browser broke!");
                               return false;
                       }
               }
       }
       
       if (responseDiv == 'searchuk') {
         var S = document.getElementById('searchuk'); 
         var processFunction='uk';
         var filterValue = document.getElementById('search_county_id').value;
       }
       
       if (responseDiv == 'searchnonuk') { 
         var S = document.getElementById('searchnonuk'); 
         var processFunction='nonuk'; 
         var filterValue = document.getElementById('search_country_id').value;
       }
       
       if (responseDiv == 'searchmap') { 
         var S = document.getElementById('searchmap');
        var processFunction='map';
       } 
       
       // Create a function that will receive data sent from the server
       ajaxRequest.onreadystatechange = function(){
               if(ajaxRequest.readyState == 4){                  
                   //alert(ajaxRequest.responseText);
                   S.innerHTML = ajaxRequest.responseText;
               }
       }
       var queryString = 'ajax/process.php?&filter=' + filterValue + '&process=' + processFunction;
	   
	       
       ajaxRequest.open("GET", queryString, true);
       ajaxRequest.send(null);
}