Table section Row Index
<html> <body> <script language="JavaScript"> function function1(elem) { var m = elem.sectionRowIndex; alert("The zero-based row index is: "+m); } </script> <table width="100" border="3" cellspacing="2" cellpadding="2"> <tr id="tr1" onclick="function1(this);"> <td>Row 1</td> </tr> <tr id="tr2" onclick="function1(this);"> <td>Row 2</td> </tr> <tr id="tr3" onclick="function1(this);"> <td>Row 3</td> </tr> <tr id="tr4" onclick="function1(this);"> <td>Row 4</td> </tr> </table> </body> </html>