Resolved Can't Remove Previous Select Options From A Dynamic Array?

I'm using ajax to update options in several select forms.Its basically, like in most automotive applications, there is a drop down for brand...once selected, it will populate another select form with the "makes" of that brand. Once a make is selected.. it returns the models of that make... and ect...The program works fine for one selection. When one brand is selected, a second select box is populated with the correct makes of cars that brand produces, however, if the brand is changed, the select box with the makes of the cars is populated by the original query..twice... and then the second query. Looking for help on whats the best way to clear both the results array; i was using this...

autobrandsf.length = 0;

and also clear out the select box, which is what the removeAllOptions() function is for. As it stands, if i use the removeAllOptions(), the makes are never populated.Here is my code, broken down the best i could, in order of process.. ish.A select form that shows the brands is displayed, once a choice is made, it passes the value of the choice into this function, which will query the database

// this is the function that is called once a brand is selected:
// h = the brand passed..
function carBrandCheck(h){[code]....

This is where, the query is returned, each row is split into an individual array, and then the second element of those individual arrays are put into yet again another array.The elements of that array are then compared against eachother to make sure there are no duplicates, storing the non-duplicates into a new array. The final array is then passed into a select form, for the makes of the selected brand.

// the ajax handler:
function handleWorkResponse(){
if(xmlHttp.readyState == 4){[code]......