function setCenter(page_width) {
	var windowWidth = getWindowWidth();
	if(document.getElementById){
		var left_margin = Math.round((windowWidth - page_width) / 2)
		document.getElementById('page').style.margin='0 0 0 ' + left_margin + 'px';
		document.getElementById('links').style.margin='6px 0 0 ' + left_margin + 'px';
	}
}

function getWindowWidth() {
	var windowWidth = 0;
	if (typeof(window.innerWidth) == 'number') {windowWidth = window.innerWidth;}  
	else {
		if (document.documentElement && document.documentElement.clientWidth) {windowWidth = document.documentElement.clientWidth;} 
		else {if (document.body && document.body.clientWidth) {windowWidth = document.body.clientWidth;}}
	}
	return windowWidth;
}