function select_id_cat(select_id_cat)
{
	var id_cat = document.getElementById('id_cat');
	
	if(select_id_cat != null)
	{
		id_cat.value = select_id_cat;
		
		var a_group = document.getElementsByTagName('a')
		var x;
		
		for(x in a_group)
		{
			if(a_group[x].className == 'selectat')
			{
			a_group[x].className = '';
			}
		}
		
		var a_selected = document.getElementById('cat_id_' + select_id_cat);
		a_selected.className = 'selectat';
		
		return true;
	}
	
	return false;

}