function positionne()
{
var oCont=document.getElementById('conteneur');
var oXmd=document.getElementById('xmenudroite');
if(oCont && oXmd)
{
	var h1=300;
	var d_st=document.body.scrollTop;//ok IE,FF,OP
	var c_h=oCont.offsetHeight;
	var m_h=oXmd.offsetHeight;
	var vp=(d_st<h1?0:d_st-h1);
	if(vp+m_h>=c_h-10)vp=c_h-10-m_h;
	if(vp<0)vp=0;
	oCont.style.paddingTop=vp+'px';
}
};