Help needed in ASP application

we are developing an Internet based application. In which we have made some Activex controls and we are embeding those controls in our ASp files. we are using HTML tag for populating the control . we have our existing system on IE3 but now we are migrating it to IE5. the problem is when the ASP runs the code gets executed faster then the control gets downloaded and since we are using the properties of the control it trhougs errors that Invalid statement . is there an wayt o know in ASP when the control is downloaded fully so that we can ensure that the code written in OnLoad() Sub will execute after that.