display a popup mesg on userControl load

Hey,

I am keen to find a way usign ajax control if possible

I can't find how to display a popup mesg using user control load. it is being called on aspx page. here is my code

     publicstaticvoid mesg()         {             ClientScript.RegisterStartupScript(this.gettype(),"strKey","strScript");         }

it doesn't find ClientSCript method neither this.gettype()..........confused!