function change_tab(nom) {
	document.getElementById('c_1').style.display = 'none';
	document.getElementById('c_2').style.display = 'none';
	
	document.getElementById('td_1').className = '';
	document.getElementById('td_2').className = '';
	
	document.getElementById('c_' + nom).style.display = 'block';
	document.getElementById('td_' + nom).className = 'td_check';
}
var speed_course = 20;
var step_course = 1;
var elm_id = 1;
var eml_position = 30;

function start_course(totalheight) {
	run_slide_course = setInterval('slide_course(' + totalheight + ')', 2000);
}

function slide_course(totalheight) {
	if (totalheight == '')
	{
		totalheight = 144;
	}	
	if (document.getElementById('c_1').style.display == 'none')
	{
		elm_id = 2;	
	}
	else
	{
		elm_id = 1;
	}
	eml_position = document.getElementById('c_' + elm_id).scrollTop + 30;
	if (eml_position > ((document.getElementById('total_' + elm_id).value * 30) - totalheight))
	{
		document.getElementById('c_' + elm_id).scrollTop = 0;
		eml_position = 0;
	}
	else
	{
		run_course = setInterval('rotate_course()', speed_course);	
	}
}
function rotate_course() {
	if (document.getElementById('c_' + elm_id).scrollTop < eml_position)
	{
		document.getElementById('c_' + elm_id).scrollTop += step_course;	
	}
	else
	{
		window.clearInterval(run_course);	
	}	
}
function newsletter() {
	makeRequest('newsletter.inc.php','newsletter_in',false, false)	
}