disable word -wrap without using in asp.net

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ASP.NET4

hi I have done the following piece of code .

<asp:Label ID="lblUploadW9" runat="server" Text="Upload W-9" /><span class="reqd">*</span>
                  </div>
                  <div class="sxlm">
                      <asp:FileUpload ID="fupUploadW9" runat="server" />
                      <div class="vldx">
                          <asp:Label runat="server" ID="lblUploadW9FileName" Text="" Style="word-break: hyphenate;"></asp:Label>
                           <asp:CustomValidator class="errmsg" ID="cusUploadW9" runat="server" ValidationGroup="grpSupAccData"
                              Display="Dynamic" ClientValidationFunction="validateUploadW9" OnServerValidate="cusUploadW9_ServerValidate" />
                      </div>
                  </div>

the jav ascript is :

function validateUploadW9(source, e)
 {
    var fileName = FSObject.$("[id$=fupUploadW9]")[0].value;
     var fileExtension = fileName.substring(fileName.lastIndexOf('.') + 1);
     if (fileName == "")
     {
        var length = FSObject.$("[id$=lblUploadW9FileName]").length;
        if (FSObject.$("[id$=lblUploadW9FileName]")[length - 1].innerHTML == "")
         {
            e.IsValid = false;
        }
        else 
        {
            if (fileExtension != ".doc" || ".DOC " || ".txt" || ".docx" || ".DOCX" || ".TXT" || ".xls" || ".xlsx" || ".XLS" || ".XLSX" || ".pdf" || ".PDF")
             {
                 FSObject.$("[id$=cusUploadW9]")[0].innerHTML = "Invalid extension, only .doc, .docx, .txt, .xls, .xlsx, .pdf and .jpg extensions are supported";
                 e.IsValid = false;
             }
             else 
            {
                e.IsValid = true;
            }
        }
    }
    else {
        if (fileExtension != ".doc" || ".DOC " || ".txt" || ".docx" || ".DOCX" || ".TXT" || ".xls" || ".xlsx" || ".XLS" || ".XLSX" || ".pdf" || ".PDF") 
        {
            FSObject.$("[id$=cusUploadW9]")[0].innerHTML = "Invalid extension, only .doc, .docx, .txt, .xls, .xlsx, .pdf and .jpg extensions are supported";
            e.IsValid = false;
        }
        else 
        {
            e.IsValid = true; 
        }
      }
       
 }

everything works fine,but the problem is that on entering invalid file type the message gets displayed wrapped with the file-upload control,I want the message to be displayed at the next line,without using
tag.