var currTimeout=null;
var currRollon=null;

function open_rollon(id)
{
	var id_immagine='img_'+id;
	document.getElementById(id_immagine).src='_ele/menu_'+id+'_r.png';
	currRollon='rollon_'+id;
	//currTimeout=setTimeout("slide_rollon();",100);
	var objRollon=document.getElementById(currRollon);
	objRollon.style.marginLeft='0px';
}

function slide_rollon(){
	var objRollon=document.getElementById(currRollon);
	var currMargin=objRollon.style.marginLeft;
	if(!currMargin){ currMargin='724px'; }
	currMargin=currMargin.replace('px','');
	currMargin=currMargin-100;
	if(currMargin<=1){
		objRollon.style.marginLeft='1px';
		clearTimeout(currTimeout);
	}
	else{
		objRollon.style.marginLeft=currMargin+'px';
		currTimeout=setTimeout("slide_rollon();",100);
	}
}

function close_rollon(id)
{
	clearTimeout(currTimeout);
	var id_immagine='img_'+id;
	document.getElementById(id_immagine).src='_ele/menu_'+id+'.png';
	var id_rollon='rollon_'+id;
	var objRollon=document.getElementById(id_rollon);
	objRollon.style.marginLeft='724px';
}