I need help.

Im trying to activate 2 diferent iframes with diferent URLs by the same button click.

I want to activate the following URLs at same time, in the same place and at same click.
<a href="diferent URL 1" target="iframe_a">text</a>
<a href="diferent URL 2" target="iframe_b">text</a>
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<iframe src="URL 1" name="iframe_a"></iframe>
<iframe src="URL 2" name="iframe_b"></iframe>
sorry if i repeated the idea, its just that in some places of internet people just give me simple links instead of just reading what i posted.