[RESOLVED] [JavaScript] Exit Sub Equivalent

I was hoping that the bold text would trap an error and exit the function.
However, the alert appears and the code continues and the form gets submitted
Is return; not the equivalent of Exit Sub? :confused:

Code:

---

function CheckForm(){
        //This should be the number of file upload boxes
        var intDUTs = document.frmUpload.cboDUTs.value;
    //Loop through all the file upload boxes and make sure that they have .txt or .rid extensions
        for (var i = 0; i < intDUTs; i++){
                //Get the filename from each box
                try{
                        var strFile = (document.forms['frmUpload'].elements['txtFileName' + i].value);
                }
                catch(err){
                       
                        //alert("Please select a file for all of the devices.");
                        alert("Error.");
                        return;
                }
                //Check for blank fields
                // alert("strFile.length " + strFile.length);
                // alert(strFile);
                // if (strFile.length = 0 || strFile = ""){
                if (strFile.length == 0){
                        alert("Please select a file for all of the devices.");
                        return;
                }
                //Get the extension from the filename
                var strExt = strFile.substring(strFile.length - 3);
                //alert("strExt = " + strExt);
                //Check for RID or TXT files
                if (strExt !== 'rid' && strExt !== 'txt'){
                        alert("Only data files in rid or txt can be uploaded.");
                        return;               
                }
                else {
                        //document.frmUpload.submit();
                }
                document.frmUpload.submit();               
        }

}

---

I should have been using return false
Where has the delete thread/post button gone?