function gel(id) { return document.getElementById(id); }

function hideGroups() 
{ 
	var groups=document.getElementsByName('group'); 
	if(groups) 
	{
		if(groups.length>0)
		{
			for(var i=0;i<groups.length;i++)
			{
				groups[i].style.display='none';
			}
		}
		else
		{
			var i=0;
			var el=gel('group_'+i);
			while(el)
			{
				el.style.display='none';
				i++;
				el=gel('group_'+i);
			}
		}
	}		
}

function showCategories(status) 
{ 
	var cats=document.getElementsByName('category'); 
	if(cats) 
	{
		if(cats.length>0)
		{
			for(var i=0;i<cats.length;i++)
			{
				cats[i].style.display=(status==1)?'':'none';
			}
		}
		else
		{
			var i=0;
			var el=gel('category_'+i);
			while(el)
			{
				el.style.display=(status==1)?'':'none';
				i++;
				el=gel('category_'+i);
			}
		}
	}		
}

function showGroup(group_id) 
{ 
	gel('group_'+group_id).style.display=(gel('group_'+group_id).style.display=='none')?'':'none';
	gel('group_'+group_id+'_arrow').src=(gel('group_'+group_id+'_arrow').src=='http://www.nortys.biz/development/bv/img/layout/hform_closed_arr.gif')?'http://www.nortys.biz/development/bv/img/layout/hform_opened_arr.gif':'http://www.nortys.biz/development/bv/img/layout/hform_closed_arr.gif';
}