[jQuery] How can I get current Index?

[din]

<TR>
    <TD>1</TD>
    <TD>JM-53</TD>
    <TD>--</TD>
    <TD>--</TD>
    <TD>--</TD>
    <TD><A href="#">ROHs</A></TD></TR>
  <TR>
    <TD>2</TD>
    <TD>JM-54</TD>
    <TD><A href="#">ROHs</A></TD>
    <TD>--</TD>
    <TD>--</TD>
    <TD><A href="#">ROHs</A></TD></TR>

I want the value of "href" in first tag A is equal to "JM-53_5.htm".
And the the value of "href" in 2nd tag A is equal to "JM-54_2.htm".
The value of "href" in 3rd tag A is equal to "JM-54_5.htm".
HOW can I get the current Index of the tag A,and HOW TO get the value
of the current 2nd tag TD.

MANY MANY THANKS~~~~