function SublinkOn(SublinkName){
	SublinkOff();
	var oDiv = document.getElementById("div_"+SublinkName)
	//eval("div_"+SublinkName+".style.display = 'block'");
	oDiv.style.display = "block"
	//alert(oDiv);
}
function SublinkOff(){
	div_abouttowngas.style.display = 'none';
	div_presscenter.style.display = 'none';
	div_investorrelations.style.display = 'none';
	div_jointventures.style.display = 'none';
}