// JavaScript Document
function tab(){
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	var part_2=document.getElementById("partTwo");
	var part_3=document.getElementById("partThree");
	var part_4=document.getElementById("partFour");
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		tabs[1].className="";
		tabs[2].className="";
		tabs[3].className="";
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		part_3.style.display="none";
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		tabs[0].className="";
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		this.className="sel";
		tabs[0].className="";
		tabs[1].className="";
		tabs[3].className="";
		tab_line.className="three"
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		part_2.style.display="none";
		part_3.style.display="block";
		part_4.style.display="none";
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	tabs[3].onclick=function(){
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		tabs[0].className="";
		tabs[1].className="";
		tabs[2].className="";
		tab_line.className="four"
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		part_2.style.display="none";
		part_3.style.display="none";
		part_4.style.display="block";
	}
}
window.onload=tab;