function uncheck(id){
	$(id).checked=false;
}


function getElementsByClassName(class_name)
	{
	var all_obj,ret_obj=new Array(),j=0,teststr;
	
	if(document.all)all_obj=document.all;
	else if(document.getElementsByTagName && !document.all)
	all_obj=document.getElementsByTagName("*");
	
	for(i=0;i<all_obj.length;i++)
		{
		if(all_obj[i].className.indexOf(class_name)!=-1)
			{
			teststr=","+all_obj[i].className.split(" ").join(",")+",";
			if(teststr.indexOf(","+class_name+",")!=-1)
				{
				ret_obj[j]=all_obj[i];
				j++;
				}
			}
		}
	return ret_obj;
	}
	
function show_hide(class_name, show_hide)
	{
	tab = getElementsByClassName(class_name);
	for(i in tab)
		{
		if(tab[i].style)
			{
			if(show_hide == 0)
				tab[i].style.visibility = 'hidden';
			else
				tab[i].style.visibility = 'visible';
			}
		}
	}

/*function verif_formule(){
	choix = $('a_option_a').value+$('a_option_b').value+$('a_option_c').value+$('a_option_d').value+$('a_option_e').value;
	// 1 personne
	alert($('nb_per').value);
	if(choix == 'a')
		{
		alert('ici');		
		}

}
*/