Access CSS in a code behind then use the following code

HtmlLink cssLink = new HtmlLink();
cssLink.Href = "%CSS FILE URL HERE%";
cssLink.Attributes.Add( "rel", "stylesheet" );
cssLink.Attributes.Add("type", "text/css");
Master.Page.Header.Controls.Add(cssLink);

How do I access an iFrame's source's variable from javascript??

document.getElementById('FrameName').contentDocument.getElementById('VarName').innerHTML

so simple, yet so hard to discover lol...