function validateSearch() {

        if ((document.project_search.s_activity_id.value == 'null') &&
                (document.project_search.s_continent_id.value == 'NULL') &&
                (document.project_search.search_keyword.value == '') &&
                (document.project_search.s_country_id.value == 'NULL')) {
                alert('Please select an Activity, Location or Keyword');
                return false;
        }

}



function doProjectSearchRequest(host) {
        var url = host + '/project_search_ajax.php';
        var aid = document.project_search.s_activity_id.value.toUpperCase();
        var ctn = document.project_search.s_continent_id.value.toUpperCase();
        var cty = document.project_search.s_country_id.value.toUpperCase();

        if ((aid == "NULL") && (ctn == "NULL") && (cty == "NULL")) return false;
        
        var pars = 'aid='+aid+'&ctn='+ctn+'&cty='+cty;
  
		$.getJSON(url,pars, function(data) {
	        $('#act_ddlist').html(data.act);
    	    $('#ctn_ddlist').html(data.ctn);
        	$('#cty_ddlist').html(data.cty);

		});

}