div.flexi1_colonne_gauche
{
padding:1em;
float:left;
width:20em;
text-align:center;
height:100%;

}

div.flexi1_colonne_droite
{
background-image: url(../images/fond_horizontale2.gif);
background-repeat: no-repeat;
background-position:left top ;
margin-left:21em;
_margin-left:expression("16em");
padding:1.5em 4em 1.5em 4em;
height:100%;
}