movey=0;
ydiff=0;
ystart=0;
ygap = 8;
spostamento = 0;
ibannerheight = 158;

function move(id_obj){
	var yy = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
	var fw = eval('document.getElementById(\''+id_obj+'\')');
    ydiff=ystart-yy;
    if ((ydiff<(-1))||(ydiff>(1))) { // se c' uno scrolling...
        movey=Math.round(ydiff/10);	
        ystart-=movey;
    }	
    if (ystart>=ibannerheight){        
		fw.style.top = (ystart-ibannerheight+10+ygap-37)+'px';
		spostamento = yy-ibannerheight;
	}
    else{
		fw.style.top = ygap+'px';
		spostamento = (yy-ibannerheight-37);
	}
    setTimeout("move('"+id_obj+"')",5);	
}