Ok, I have done the search through the forum.....I see the security issues with AJAX in FF and I checked in the URL calls, they are staying within the domain and not going to a third party. I did not write the AJAX script and I am pretty new to AJAX, my boss's son wrote it a few years ago. It was working on an older version of FF but not with the latest download. It also does not work in the latest Opera or Chrome, but works fine with IE7. Any ideas?

// JavaScript Document
function undisable_city(){
	var num = document.restaurant_search.select_state.selectedIndex;
	
	if(num==0){
	document.restaurant_search.select_city.disabled=true;
	}else{
	document.restaurant_search.select_city.disabled=false;
	}
}

function createXMLHttp(){
	
	if(typeof XMLHttpRequest != "undefined"){
		return new XMLHttpRequest();
	} else if (window.ActiveXObject){
		var aVersions = [ "MSXML2.XMLHttp.5.0", "MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0","MSXML.XMLHttp","Microsoft.XMLHttp"];
		for (var i = 0; i < aVersions.length; i++){
			try{
				var oXmlHttp = new ActiveXObject(aVersions[i]);
				return oXmlHttp;
				
			}catch(oError){
				//Do Nothing
			}
		}
	}
	
}

function sendCityRequest(){
            var oForm = document.restaurant_search;
            var sBody = getCityRequestBody(oForm);
        
            var oXmlHttp = createXMLHttp();
			if(navigator.appName == "Microsoft Internet Explorer")
{
            oXmlHttp.open("post", "*/goEdit/functions/find_cities.php", true);
}else{
			oXmlHttp.open("post", "functions/find_cities.php", true);
}
            oXmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            
            oXmlHttp.onreadystatechange = function () {
                if (oXmlHttp.readyState == 4) {
                    if (oXmlHttp.status == 200) {
						
                        saveCityResult(oXmlHttp.responseText);
                    } else {
						
                        saveCityResult("An error occurred: " + oXmlHttp.statusText);
                    }
                }            
            };
            oXmlHttp.send(sBody);        
        }
        
        function getCityRequestBody(oForm){
            var aParams = new Array();
            
            for (var i=0 ; i < oForm.select_state.length; i++) {
                var sParam = encodeURIComponent(oForm.select_state.name);
                sParam += "=";
                sParam += encodeURIComponent(oForm.select_state.value);
                aParams.push(sParam);
            } 
            
            return aParams.join("&");        
        }
        
        function saveCityResult(sMessage){
			
           var select_city = document.getElementById("select_city");
            select_city.innerHTML = sMessage;
			 
        }		
		
		function undisable_category(){
	var num=document.restaurant_search.select_city.selectedIndex;
	
	if(num==0){
	document.restaurant_search.select_category.disabled=true;
	}else{
	document.restaurant_search.select_category.disabled=false;
	}
}

		
		function sendCategoryRequest(){
            var oForm = document.restaurant_search;
            var sBody = getCategoryRequestBody(oForm);
        
            var oXmlHttp = createXMLHttp();
			if(navigator.appName == "Microsoft Internet Explorer")
{
            oXmlHttp.open("post", "*/goEdit/functions/find_categories.php", true);
}else{
            oXmlHttp.open("post", "functions/find_categories.php", true);
}
            oXmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            
            oXmlHttp.onreadystatechange = function () {
                if (oXmlHttp.readyState == 4) {
                    if (oXmlHttp.status == 200) {
						
                        saveCategoryResult(oXmlHttp.responseText);
                    } else {
						
                        saveCategoryResult("An error occurred: " + oXmlHttp.statusText);
                    }
                }            
            };
            oXmlHttp.send(sBody);        
        }
        
        function getCategoryRequestBody(oForm){
            var aParams = new Array();
            
			for (var i=0 ; i < oForm.select_state.length; i++) {
                var sParam = encodeURIComponent(oForm.select_state.name);
                sParam += "=";
                sParam += encodeURIComponent(oForm.select_state.value);
                aParams.push(sParam);
            } 
			
            for (var i=0 ; i < oForm.select_state.length; i++) {
                var sParam = encodeURIComponent(oForm.select_city.name);
                sParam += "=";
                sParam += encodeURIComponent(oForm.select_city.value);
                aParams.push(sParam);
            } 
            
            return aParams.join("&");        
        }
        
        function saveCategoryResult(sMessage){
			
           var select_category = document.getElementById("select_category");
            select_category.innerHTML = sMessage;
			 
        }

if you see an * in a directory area, that just replaces the domain. I did not feel comfortable posting the domain.

Also I re-wrote it to catch IE v FF. I was trying to single out IE.

What I have discovered is, in FF, my city value from the drop down list that is created in the following, is not being passed. It is in IE though. Here is my find_city script....

$city_dropmenu = @mysql_db_query($dbname, $city_dropmenu_query, $link);

			while($city_selections = @mysql_fetch_array($city_dropmenu)){
						$all_cities[] = $city_selections['rest_city'];
						};
			@sort($all_cities);
			@reset($all_cities);			
						
			$n = 0;				
			while($n <= count($all_cities)){
				if($n == 0){
					$condensed_cities[0] = $all_cities[0];
				}
				else{ 
					if($all_cities[$n] == $all_cities[$n - 1]){
					}
					else{
						$condensed_cities[] = $all_cities[$n];
					};
				};
				$n++;
			};
			
			$status = "<select name=\"select_city\"  onChange=\"sendCategoryRequest(), undisable_categories()\" class=\"searchfields\"><option value=\"\">";
							$status .= "Select a Category";					
							$status .= "</option>";
						
						$n = 0;	
						while($n <= count($condensed_cities)){
							$status .= "<option value=\"$condensed_cities[$n]\">";
							$status .= "$condensed_cities[$n]";
							$status .= "</option>";
							$n++;
						};
						$status .= "</select>";
			print $status;
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