function showSubmenu(){
changeOpac(40,'content_rtl');
showDiv('submenu');
opacity('submenu', 0, 100, 500) ;


}
function hideSubmenu(){
	
	hideDiv('submenu');
	changeOpac(100,'content_rtl');

}
function menuOver(id,m){
	menuOut(m);
	document.getElementById(id).style.backgroundImage='url(src_img/bg_click.png)';

}
function menuOut(m){
	
	for(i=0;i<m;i++){
	document.getElementById('m_'+i).style.background='none';
	
	}
}