JS Prompt box - OnCancel Click handle

function validatePage()

{

var check = true;

if ($("#txtImportant").val() == '') check = false;

if (!check)

{

window.open(destinationurl, 'welcome', 'width=700,height=400,resizable=yes,menubar=yes,status=yes,location=yes,toolbar=yes,scrollbars=yes');

return false;

}

else//cancel button code

{

window.open(homepageurl, 'welcome', 'width=700,height=400,resizable=yes,menubar=yes,status=yes,location=yes,toolbar=yes,scrollbars=yes');

return true;

}

}