cur_page = "link1";

function chooseContent(show_content) {
	document.getElementById("content1").style.display = "none";
	document.getElementById("content2").style.display = "none";
	document.getElementById("content3").style.display = "none";
	document.getElementById("content" + show_content).style.display = "block";
	
	document.getElementById("link1").className = "there";
	document.getElementById("link2").className = "there";
	document.getElementById("link3").className = "there";
	document.getElementById("link" + show_content).className = "here";
}