function open_close(idn)
{
	if(document.getElementById(idn).style.display=='none')
		document.getElementById(idn).style.display = 'block';
	else
	document.getElementById(idn).style.display = 'none';
} 

var submenus = new Array();
submenus[0] = 'sub1';
submenus[1] = 'sub2';
submenus[2] = 'sub3';
submenus[3] = 'sub4';
submenus[4] = 'sub5';

function open_close_sub(idn) {
	if(document.getElementById(idn).style.display=='none')
		document.getElementById(idn).style.display = 'block';
	else
		document.getElementById(idn).style.display = 'none';
	
	for (i=0; i<submenus.length; i++) {
		if (submenus[i] != idn ) document.getElementById(submenus[i]).style.display = 'none';
		
	}
	
}