function $(n){
  return document.getElementById(n)
}
function what_height(id_name){   
    var element = document.getElementById(id_name);
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
	return originalHeight;
}
function height100(){
	var old=what_height("content");
	if((what_height("content")>what_height("right_col"))&&(what_height("content")>what_height("left_col"))){
		old.style.height='auto';
	}
	if(what_height("left_col")>what_height("right_col")){
		$("content").style.height=(what_height("left_col"))+'px';
	}
	else{
		$("content").style.height=(what_height("right_col"))+'px';
	}
}