error Unable to get property 'display' of undefined or null reference
<pre><code>&lt;script language="javascript"&gt;

    function dropOrderDropDown() {
        var currentInThisElement = document.activeElement.id
        var currentInThisElementArray = currentInThisElement.split('_')
        var foundOneToDrop = false;
        var haveOneCurrentSelected = false;
        var dropDownTempArray = new Array();
        if ((dropDownDivValuesString != "") || (dropDownDivValuesString != null)){
            dropDownTempArray = dropDownDivValuesString.split(',');
            for (i=0; i &lt; dropDownTempArray.length - 1; i++){
                if (acdf != dropDownTempArray[i]){
                    if (document.all[dropDownTempArray[i] + "_hideThisControl"] != null){
                        if (document.all[dropDownTempArray[i] + "_hideThisControl"].style.display != "none"){
                            if (document.all[dropDownTempArray[i] + "_dropdown"] != null){
                                if (document.all[dropDownTempArray[i] + "_dropdown"].style.display == "block"){
                                    document.all[dropDownTempArray[i] + '_txtValue'].click();
                                }
                            }
                        }
                    }
                }
            }
        }
        acdf = "";  
        return true;
&lt;/script&gt;
</code></pre>