.bandeauAccueil
{
position:relative;width:1000px;text-align:left;padding:0px;margin-left: auto; margin-right: auto;background-repeat: no-repeat;background-position:left top;
background-image: url(../images/fondaccueil.jpg);
}

.cadreAccueil
{
padding:5px;position:relative;top:100px;left:10px;width:980px;margin-left: 0px; margin-right:0px
}