$(document).ready(function() {
    $("#ctl00_ContentPlaceHolder1_ImageButton1").click(function() {
        var i;
        var hidden = false;

        //cat 1
        if ($("#ctl00_ContentPlaceHolder1_ctl00_ctl02").css("visibility") != "hidden") { hidden = true; }
        if ($("#ctl00_ContentPlaceHolder1_ctl04_ctl00").css("visibility") != "hidden") { hidden = true; }
        if ($("#ctl00_ContentPlaceHolder1_ctl06_ctl00").css("visibility") != "hidden") { hidden = true; }

        //cat 2
        for (i = 0; i <= 4; i++) {
            if ($("#ctl00_ContentPlaceHolder1_Category_2_ctl0" + i + "_ctl00").css("visibility") != "hidden") {
                hidden = true;
            }
        }

        //cat 3
        for (i = 0; i <= 3; i++) {
            if ($("#ctl00_ContentPlaceHolder1_Category_3_ctl0" + i + "_ctl00").css("visibility") != "hidden") {
                hidden = true;
            }
        }

        //cat 4
        for (i = 0; i <= 4; i++) {
            if ($("#ctl00_ContentPlaceHolder1_Category_4_ctl0" + i + "_ctl00").css("visibility") != "hidden") {
                hidden = true;
            }
        }

        //cat 5
        for (i = 0; i <= 4; i++) {
            if ($("#ctl00_ContentPlaceHolder1_Category_5_ctl0" + i + "_ctl00").css("visibility") != "hidden") {
                hidden = true;
            }
        }

        //cat6
        if ($("#ctl00_ContentPlaceHolder1_Category_6_ctl00_ctl00").css("visibility") != "hidden") { hidden = true; }
        //cat7
        if ($("#ctl00_ContentPlaceHolder1_Category_7_ctl00_ctl00").css("visibility") != "hidden") { hidden = true; }
        //cat8
        if ($("#ctl00_ContentPlaceHolder1_Category_8_ctl00_ctl00_ctl00").css("visibility") != "hidden") { hidden = true; }

        if (hidden) {
            $("#ErrorDiv").css("display", "block");
        }
        else
            $("#ErrorDiv").css("display", "none");
    });
});