Grouping in dropdownlist in ASP.NET

HTML

<select id="mySelect">
    <option optGroup='a'>1</option>
    <option optGroup='a'>1</option>
    <option optGroup='a'>1</option>
    <option optGroup='b'>2</option>
    <option optGroup='b'>2</option>
</select>

JQuery

function SetupOptGroups(select) {
    var optGroups=new Array();    
    var i = 0;

    $(select).find("[optGroup]").each(function(index, domEle) {
        var optGroup = $(this).attr("optGroup");
        if ($.inArray(optGroup, optGroups)==-1) optGroups[i++] = optGroup;
    });

    for(i=0; i < optGroups.length; i++){
        $("option[optGroup='"+optGroups[i]+"']").wrapAll("<optgroup label='"+optGroups[i]+"'>");
    }
}