var contentpage;
function page_change(page) {
	contentpage = document.getElementById('page1');
	contentpage.className = 'pagecontenthidden';
	contentpage = document.getElementById('page2');
	contentpage.className = 'pagecontenthidden';
	contentpage = document.getElementById('page3');
	contentpage.className = 'pagecontenthidden';
	contentpage = document.getElementById('page4');
	contentpage.className = 'pagecontenthidden';
	contentpage = document.getElementById('page5');
	contentpage.className = 'pagecontenthidden';

	contentpage = document.getElementById(page);
	contentpage.className = 'pagecontentvisible';

}