disable button after click

Question

hi,
i am having a usercontrol in an Aspx page.the user controls contains execute button. click event of the button invokes some email sending action.the user control has check box and a text box validators which has to be valid to make the page post back.when the user clicks twice it is sending 2 emails which it not supposed to. to solve that i have added
RegisterOnSubmitStatement("ServerForm", "if (this.submitted) return false; this.submitted = true; return true;"); in page load event of the aspx page.its not sending 2 mails but it disables my validation.

and i followed another approach by researching forums ,tried to hide actual execute button and create anothe html button and on clicking that i try to invoke the original button and disable the html button but i coudn't fire the click event of the original button. is there any other ways to solve this. or i am missing some thing. plz help


Thanks,
Ranne.