function calcHeight(){
	var divHeader;
	var headerHeight;
	var divContent;
	var contentHeight;
	var scrHeight;

	divHeader = document.getElementById('header');

	if(divHeader.offsetHeight){
		headerHeight = divHeader.offsetHeight;
	} else if(divHeader.style.pixelHeight){
		headerHeight = divHeader.style.pixelHeight;
	}

	divContent = document.getElementById('content');

	if(document.all) {
		scrHeight = document.body.clientHeight;
	} else {
		scrHeight = window.innerHeight;
	}

	contentHeight = (scrHeight - headerHeight);

	divContent.style.height=contentHeight+'px';
}