function changeNewsMain_tab(div){
	var tab=$(div);
	Element.removeClassName($('Politics'),'cur');Element.hide('NewsMain_Politics');
	Element.removeClassName($('Organ'),'cur');Element.hide('NewsMain_Organ');
	Element.removeClassName($('Civilized'),'cur');Element.hide('NewsMain_Civilized');
	Element.removeClassName($('People'),'cur');Element.hide('NewsMain_People');
	Element.removeClassName($('Reportor'),'cur');Element.hide('NewsMain_Reportor');
	Element.addClassName(tab,'cur');
	Element.show('NewsMain_'+div);
}