function contacto(){
	var chasm = screen.availWidth;
	var mount = screen.availHeight; 
	var anchoventana = 480;
	var altoventana = 500;
	var posicionx = (chasm-anchoventana)/2;
	var posiciony = (mount-altoventana)/2;
	window.open('http://www.clientes.concentra.mx/345_distribuidora/contacto/remote_contact.html','noticias','top='+ posiciony +',left='+ posicionx +',width='+ anchoventana +',height='+ altoventana +', scrollbars=0');

}