设置默认选项

		<script language="JavaScript" type="text/JavaScript">
function setDefaultExportType()
{
	if (reportDetail.exportType.length)
   	{
 		reportDetail.exportType[0].checked=true
 	}
 	else
 	{
 	    reportDetail.exportType.checked=true
 	}
}      
        setDefaultExportType()
	  </script>