try this:
function initMap() {
...
...
resizeMap();
...
...
}
function resizeMap() {
if (map) {
var myWidth;
var myHeight;
if (typeof (window.innerWidth) == 'number') {
//Non-IE
myWidth = window.innerWidth;
myHeight = window.innerHeight;
}
else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
//IE 6+ in 'standards compliant mode'
myWidth = document.documentElement.clientWidth;
myHeight = document.documentElement.clientHeight;
}
else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
//IE 4 compatible
myWidth = document.body.clientWidth;
myHeight = document.body.clientHeight;
}
//resize map section
var a = myHeight - 128;
$('#map').css("height", a);
$('#map').css("width", "auto");
document.getElementById("mapcontent").style.height = myHeight - 120 + "px";
map.reposition();
map.resize();
}
}