Вставь декларацию в начало программы:
Private Declare Function ShellExecute Lib "shell32.dll" Alias _
"ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, _
ByVal lpFile As String, ByVal lpParameters As String, _
ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
И вызови, где надо
ShellExecute vbNull, "open", "
http://www.deltacom.co.il/rus", 0&, 0&, 3