iframe problem,

i have taken 2 iframes .in 1st iframe, i have given the src 2.php in which i have written india , and now on the click of india , new window opwns but i want to open in the second iframe

google chrome is responding fine but in mozilla, new window is opening?
what can be the reason?

please see the code.

1.php
 
<iframe id="datamain" src="2.php" width=130 height=250 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
 
<iframe id="display" src="4.php" width=330 height=400 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0scrolling=no></iframe>
 
2.php
 
<a target="display" href="3.php">India</a>
 
3.php
 
3
 
4.php
 
4

Select allOpen in new window