Default SharePoint File Upload Control

SharePoint File Upload Control

  <tr> <td> Upload Related Documents (If Any) </td> <td valign="bottom" id="attachmentsOnClient"> <span dir="ltr"> <input type="file" name="fileupload0" id="onetidIOFile" size="56" title="Name" /> </span> </td> </tr> <tr> <td colspan="4"> <span id="idSpace"/> <div> <input id="attachOKbutton" type="BUTTON" onclick='OkAttach()' value="Upload" style="width:auto; height:auto"/> </div> </td> </tr>

Or

<script type="text/javascript">
function AttachFile()
{
 SP.Ribbon.PageManager.get_instance().executeRootCommand("Ribbon.ListForm.Edit.Actions.AttachFile", null, null, null);
}
</script>
<a onclick='javascript:AttachFile();'>browse</a>