function ChangeMainContent(a) {
	if (a==1) {
		document.getElementById('NewsTitleTD').style.background="white url('../Images/Title_01_1.gif') no-repeat right bottom";
		document.getElementById('DocTitleTD').style.background="white url('../Images/Title_02_0.gif') no-repeat right bottom";
		document.getElementById('BillsTitleTD').style.background="white url('../Images/Title_03_0.gif') no-repeat right bottom";
		document.getElementById('Div_News').style.display="inline";
		document.getElementById('Div_Docs').style.display="none";
		document.getElementById('Div_Bills').style.display="none";
	}
	else if (a==2) {
		document.getElementById('NewsTitleTD').style.background="white url('../Images/Title_01_0.gif') no-repeat right bottom";
		document.getElementById('DocTitleTD').style.background="white url('../Images/Title_02_1.gif') no-repeat right bottom";
		document.getElementById('BillsTitleTD').style.background="white url('../Images/Title_03_0.gif') no-repeat right bottom";
		document.getElementById('Div_News').style.display="none";
		document.getElementById('Div_Docs').style.display="inline";
		document.getElementById('Div_Bills').style.display="none";
	}
	else if (a==3) {
		document.getElementById('NewsTitleTD').style.background="white url('../Images/Title_01_0.gif') no-repeat right bottom";
		document.getElementById('DocTitleTD').style.background="white url('../Images/Title_02_0.gif') no-repeat right bottom";
		document.getElementById('BillsTitleTD').style.background="white url('../Images/Title_03_1.gif') no-repeat right bottom";
		document.getElementById('Div_News').style.display="none";
		document.getElementById('Div_Docs').style.display="none";
		document.getElementById('Div_Bills').style.display="inline";
	}
}