function agregar()
{ 
if ((navigator.appName=="Microsoft Internet Explorer") && (parseInt(navigator.appVersion)>=4)) { 
var url="http://www.cartasymensajes.com"; 
var titulo="MegaPortal de Servicios"; 
window.external.AddFavorite(url,titulo); 
} 
else 
{ 
if(navigator.appName == "Netscape") 
alert ("Presione Crtl+D para agregar este sitio en sus Bookmarks"); 
}
}

<!-- // MenuBuilder 3.0

function load1(form) {
     var url = form.Llist_1.options[form.Llist_1.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load2(form) {
     var url = form.Llist_2.options[form.Llist_2.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load3(form) {
     var url = form.Llist_3.options[form.Llist_3.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load4(form) {
     var url = form.Llist_4.options[form.Llist_4.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load5(form) {
     var url = form.Llist_5.options[form.Llist_5.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load6(form) {
     var url = form.Llist_6.options[form.Llist_6.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load7(form) {
     var url = form.Llist_7.options[form.Llist_7.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load8(form) {
     var url = form.Llist_8.options[form.Llist_8.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load9(form) {
     var url = form.Llist_9.options[form.Llist_9.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load10(form) {
     var url = form.Llist_10.options[form.Llist_10.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load11(form) {
     var url = form.Llist_11.options[form.Llist_11.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load12(form) {
     var url = form.Llist_12.options[form.Llist_12.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load13(form) {
     var url = form.Llist_13.options[form.Llist_13.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load14(form) {
     var url = form.Llist_14.options[form.Llist_14.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load15(form) {
     var url = form.Llist_15.options[form.Llist_15.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load16(form) {
     var url = form.Llist_16.options[form.Llist_16.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load17(form) {
     var url = form.Llist_17.options[form.Llist_17.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load18(form) {
     var url = form.Llist_18.options[form.Llist_18.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load19(form) {
     var url = form.Llist_19.options[form.Llist_19.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load20(form) {
     var url = form.Llist_20.options[form.Llist_20.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load21(form) {
     var url = form.Llist_21.options[form.Llist_21.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load22(form) {
     var url = form.Llist_22.options[form.Llist_22.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load23(form) {
     var url = form.Llist_23.options[form.Llist_23.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load24(form) {
     var url = form.Llist_24.options[form.Llist_24.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load25(form) {
     var url = form.Llist_25.options[form.Llist_25.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load26(form) {
     var url = form.Llist_26.options[form.Llist_26.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load27(form) {
     var url = form.Llist_27.options[form.Llist_27.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load28(form) {
     var url = form.Llist_28.options[form.Llist_28.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load29(form) {
     var url = form.Llist_29.options[form.Llist_29.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load30(form) {
     var url = form.Llist_30.options[form.Llist_30.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load31(form) {
     var url = form.Llist_31.options[form.Llist_31.selectedIndex].value;
     if (url != '') open(url);
     return false;
}

function load32(form) {
     var url = form.Llist_32.options[form.Llist_32.selectedIndex].value;
     if (url != '') open(url);
     return false;
}
// -->