function getDivHeight(){
	g=document.getElementById("sidebar").offsetHeight;
	h=document.getElementById("main_content").offsetHeight;
	if(g>h){
		i=(g)/28;
		
	}else{
		i=(h)/28;
	}
	j = parseInt(i);
	k = j*28;
	k+=28;
	
	l = k+"px";
	document.getElementById('sidebar').style.height=l;

}
getDivHeight();