var larg=screen.width;
var haut=screen.height-100;
function rechvis(){		  
		  if (larg<900)
		  {
		  larg=screen.width-100;
		  }
		  else
		  {
		  larg=1000;
		  }
		  window.open("recherche_visuelle.html", '', 'width=1000, height=700,  menubar=no, status=yes, scrollbars=yes, location=nos, directories=no');
	}