function alertSize() {
	myHeight = 0;
	myWidth = 0;
	
	if( typeof( window.innerWidth ) == 'number' ) {
		//Non-IE
		myHeight = window.innerHeight;
		myWidth = window.innerWidth;
		} else {
			if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
				//IE 6+ in 'standards compliant mode'
				myHeight = document.documentElement.clientHeight;
				myWidth = document.documentElement.clientWidth;
			} else {
			if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
				//IE 4 compatible
				myHeight = document.body.clientHeight;
				myWidth = document.body.clientWidth;
			}
		}
	}
	
	contentHoogte=myHeight-97;
	
	if(contentHoogte<0){
		contentHoogte=0;
	}
	
	if(document.all){
		document.all.mid.style.height=contentHoogte+'px';
	}
	else{
		document.getElementById("mid").style.height=contentHoogte+'px';
	}
};

window.onresize = alertSize;