// JavaScript Document



var current_scroll_indexes = new Array() ;


function scroll_forward(id, num_index) {
	
	if (! current_scroll_indexes[id])
		current_scroll_indexes[id] = 0 ;
	
	if (current_scroll_indexes[id] >= num_index - 1)
 		return ;
		
	scroll_div_to(id, 480 * ++current_scroll_indexes[id]) ;
}

function scroll_backward(id) {
	
	if (! current_scroll_indexes[id])
		current_scroll_indexes[id] = 0 ;

	if (current_scroll_indexes[id] <= 0)
		return ;
		
	scroll_div_to(id, 480 * --current_scroll_indexes[id]) ;
}