Chart width when using a single iframe (embed) for multiple charts

Chart width when using a single iframe (embed) for multiple charts

Hello,

I use a single iframe to display charts depending on which one the user wants to see (links on a page). Is it possible to still define the chart width using a URL which targets the iframe? I tried sticking "&WIDTH=700" into the url but it doesn't seem to work like it does in the iframe src attribute.

Thanks.