function getSize() {
    var myWidth = 0, myHeight = 0;

    if( typeof( window.innerWidth ) == 'number' ) {
        //Non-IE        
        myWidth = window.innerWidth;
        myHeight = window.innerHeight;
        
    } else {
        //IE 6+ in 'standards compliant mode'
        myWidth = document.documentElement.clientWidth;
        myHeight = document.documentElement.clientHeight;
        
        //myWidth = document.body.clientWidth;
        //myHeight = document.body.clientHeight;
    }
    return [ myWidth, myHeight ];
}

var size = getSize();

window.onLoad = document.getElementById("page_inner").style.height = (size[1]-65)+"px";

window.onresize = function (){

	var size = getSize();

	document.getElementById("page_inner").style.height = (size[1]-65)+"px";
}