function over(a,t)
	{
	var b=new Array('soft','onserv','res','cont');
	for (var i=0; i<b.length; i++)
		{
		if(t==b[i]) {b.splice(i,1);}
		else continue
		}
	if(document.getElementById(a).style.display=='block') {document.getElementById(a).style.display='none';}
	else
		{
		document.getElementById(a).style.display='block';
		for (var i=0; i<b.length; i++)
			{
			if(a==b[i]) {b.splice(i,1);}
			else continue
			}
		for (var i=0; i<(b.length); i++)
			{
			document.getElementById(b[i]).style.display='none';
			}
		}
	}