I\'ve tried this:
string newScript = textBox1.Text;
HtmlElement head = browserCtrl.Document.GetElementsByTagName(\"head\")[0];
HtmlElement scriptEl = browser
What you want to do is use Page.RegisterStartupScript(key, script) :
See here for more details: http://msdn.microsoft.com/en-us/library/aa478975.aspx
What you basically do is build your javascript string, pass it to that method and give it a unique id( in case you try to register it twice on a page.)
EDIT: This is what you call trigger happy. Feel free to down it. :)