Help needed with multiple select form element and PHP !

Hi, I've got a select tag with multiple selection enabled. When the user submit the form, I want to pass all options from the select to another page. For this I use javascript to select every element in my select tag. My problem, is that in PHP, to access all selected elements in an array, I need to give my select tag a name like 'myselect[]'. If I use this naming, I can't use my Javascript code to select every element before submitting the form. How can I get both thing to work : my javascript code to select every element, and my php code to access every element ?? Thanks for any answer.