$(document).ready(function(){

	var heightMain = $("#main").height();

	if (heightMain < 500) {
		$("#main").css("height","500px");
	}
	
	var heightBody = $(document.body).height();
	var heightWindow = $(window).height();
	
	if (heightBody < heightWindow) {
		var heightMain = heightWindow-292+"px";
		$("#main").css("height",heightMain);
	}	
});

$(window).resize(function() {

	var heightBody = $(document.body).height();
	var heightWindow = $(window).height();
	var heightMain = $("#main").height();
	var heightMainContent = $("#main #mainleft").height();
	
	if (heightWindow > heightBody) {
		var heightMain = heightWindow-292;
		$("#main").css("height",heightMain+"px");	
	} else if (heightMainContent+15 < heightMain) {
		var heightMain = heightWindow-292;
		if(heightMain < 500) {
			heightMain = 500;
		}
		$("#main").css("height",heightMain+"px");
	}
})