Error: $ is not a function
Why: Jquery conflicts wiht another scripts
How fix: To wrap the function into this anonymous JavaScript function:

( function($) {
	// code goes here 
} ) ( jQuery );

Result example

( function($) {
	$(document).ready(function(){
    $('.closeinfo').click(function(){
        $('#information').fadeOut("900");
    });
});
} ) ( jQuery );
</script>