function changeHeightAboutUs(){
	var varColumnLeft=document.getElementById("left_column");
	var varColumnRight=document.getElementById("right_column");
	
	varColumnLeft.style.height="1100px";
	varColumnRight.style.height="1000px";
}

/*function changeHeightContactUs(){
	var varColumnLeft=document.getElementById("left_column");
	var varColumnRight=document.getElementById("right_column");
	
	varColumnLeft.style.height="100%";
	varColumnRight.style.height="100%";
}*/