/**
 * this function is setting window height size.
 */
$(function() {
	var main_height = $("#main").attr("offsetHeight");
    var headr_height = $("#header").attr("offsetHeight");
    var footer_height = $("#footer").attr("offsetHeight");
	var wind_height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;

	var main = eval(main_height + 10);
	var page = eval(headr_height + main + footer_height);

	if (wind_height > page) {
	    main = eval(wind_height - (headr_height + footer_height + 30));
	    page = eval(headr_height + main + footer_height);
	}

	$("#main").height(main);
	$("#page").height(page);
});