var w=800; /* popup window width*/
var h=540; /* popup window height*/

var l=(screen.width-w)/2; /*this centers horizontally*/
var t=(screen.height-h)/2; /*this centers vertically*/

var url="http://www.pereire-assurances.com/Fr_pereire/Produits_Assurances/Commun/A_propos.php";
var url2="http://www.pereire-assurances.com/Fr_pereire/Produits_Assurances/Commun/Mention_legales.php";

var features="left="+l+",top="+t+",width="+w+",height="+h+",scrollbars=auto";
var features2="left="+l+",top="+t+",width="+w+",height="+h+",scrollbars=yes";

function popItUp() { 
window.open(url,"",features);
}

function popMentLeg() { 
window.open(url2,"",features2);
}