브랜드별,모델별로 검색하는 건데요 익스에서는 되는데 그외 크롬이나 사파리에선 안돼네요
어떤식으로 수정해야 좋을까요?
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 function makechange()
    {
        var f = document.fsearch_cars;

        brandview(f.make.value);
    }


    function brandchange()
    {
        var f = document.fsearch_cars;

      }


    function locaview()
    {
        var f = document.fsearch_cars;

        f.loca.options.length = 1;
        f.loca.options[0].text = "지역(전체)";
        car = cars["지역"].split(",");
        f.loca.options.length = car.length+1;
        for (i=0; i<car.length; i++) {
            f.loca.options[i+1].value = car[i];
            f.loca.options[i+1].text = car[i];
        }
    }



    function yearview()
    {
        var f = document.fsearch_cars;

        f.year.options.length = 1;
        f.year.options[0].text = "연식(전체)";
        car = cars["연식"].split(",");
        f.year.options.length = car.length+1;
        for (i=0; i<car.length; i++) {
            f.year.options[i+1].value = car[i];
            f.year.options[i+1].text = car[i];
        }
    }

    function modelview(make, brand)
    {
        var f = document.fsearch_cars;

        f.model.options.length = 1;
        f.model.options[0].text = "등급(전체)";
        f.model.options[0].selected = true;
        if (!make || !brand) {
            return;
        }

        car = cars[make+"->"+brand].split(",");
        f.model.options.length = car.length+1;
        for (i=0; i<car.length; i++) {
            f.model.options[i+1].value = car[i];
            f.model.options[i+1].text = car[i];
        }
    }

function brandview(make)
    {
        var f = document.fsearch_cars;

        f.brand.options.length = 1;
        f.brand.options[0].text = "모델(전체)";
        f.brand.options[0].selected = true;
        if (!make) {
            return;
        }

        car = cars[make].split(",");
        f.brand.options.length = car.length+1;
        for (i=0; i<car.length; i++) {
            f.brand.options[i+1].value = car[i];
            f.brand.options[i+1].text = car[i];
        }
    }

    function makeview()
    {
        var f = document.fsearch_cars;

        f.make.options.length = 1;
        f.make.options[0].text = "브랜드(전체)";
        car = cars["제조사"].split(",");
        f.make.options.length = car.length+1;
        for (i=0; i<car.length; i++) {
            f.make.options[i+1].value = car[i];
            f.make.options[i+1].text = car[i];
        }
    }
function onChangeKey() {
var make = document.fsearch_cars.make.value;
var brand = document.fsearch_cars.brand.value;
var year = document.fsearch_cars.year.value;
var loca = document.fsearch_cars.loca.value;     

if (make == "" && brand == ""&& year == ""&& loca == "") {
alert("브랜드나 연식을 선택하세요!!");
return false;
} else {
if (year == ""&& loca == "")  {
document.fsearch_cars.stx.value = make+ " " + brand;
} else {
  if (loca == "")  {
document.fsearch_cars.stx.value = make + " " + year + " " + brand;
}else {

document.fsearch_cars.stx.value = make + " " + brand + " " + loca + " " + year;
}
}
document.fsearch_cars.submit();
}
}