i have two iframes side by side.i want users to type a keyword in a search bar,click, and the keyword would replace a (specified) characters in the iframes and display the content.

1st iframe.
<iframe name="cwindow" style="border:2px solid black" width=50 height=20 src="http://www.dynamicdrive.com/@@@/" target="cwindow"></iframe>

2nd iframe
<iframe name="cwindow" style="border:2px solid black" width=50 height=20 src="http://www.dynamicdrive.com/forums/@@@/" target="cwindow"></iframe>

*so, upon entring a keyword in a search field(and clicking) the keyworld would replace all @@@ in iframe.

i have tried several codes including remote scripting in iframe. does is involve PHP? i can't seems to understand. can anyone please give me code and instruction on how to use it?