function setHeight() {
	var _topBlock = document.getElementById("main-top").offsetHeight;
	var _headerBlock = document.getElementById("header").offsetHeight;
	var _footerBlock = document.getElementById("footer").offsetHeight;
	var _main =document.getElementById("wrapper2").offsetHeight;
	
		var _res = document.body.offsetHeight -  _footerBlock - _headerBlock - _topBlock -66;
if(parseInt(_res) > 0){
  document.getElementById("main-mid").style.minHeight =  (_res) + "px";
}
}
function setHeightIE() {
	var _topBlock = document.getElementById("main-top").offsetHeight;
	var _headerBlock = document.getElementById("header").offsetHeight;
	var _footerBlock = document.getElementById("footer").offsetHeight;
	var _main =document.getElementById("wrapper2").offsetHeight;
	
		var _res = document.body.offsetHeight -  _footerBlock - _headerBlock - _topBlock -66;
		document.getElementById("main-mid").style.height =  _res + "px";
}

if (window.addEventListener) {
	window.addEventListener("load", setHeight, false);
	window.addEventListener("resize", setHeight, false);
}
else if (window.attachEvent) {
	window.attachEvent("onload", setHeight);
	window.attachEvent("onresize", setHeight);
}
else if (window.attachEvent && !window.opera){
	window.attachEvent("onload", setHeightIE);
	window.attachEvent("onresize", setHeightIE);
}