var globalHeight = new function() {
	
	this.init = function() {
		var self = globalHeight;
		
		if (!document.getElementById || !document.getElementsByTagName ){
			alert('Please download a newer browser version')
			return;
		}
		window.onresize = self.setHeightColumn();
	};
	
	this.setHeightColumn = function() {
	  var self = globalHeight;
	  var elm = document.getElementById('main_body');	  
	  elm.style.height = 'auto';
	  var x = elm.offsetHeight;	  
	  elm.style.height = x + "px";
	};
}

//window.onload = globalHeight.init;