var bSlider = true;
var active_slider = '';

function slider(id) {
	if(bSlider) {
		if(active_slider == id) {
			Effect.SlideUp(id, { 
				beforeStart : function() { 
				bSlider = false; 					
				}, 
				duration: 0.50,
				afterFinish : function() { 
					$(id + '_pijl').innerHTML = '<img src="images/templates/pijltje_faq_dicht.gif" />'; 
					$('bg_'+id).style.background = 'url(images/templates/line_slider.gif) repeat-x left bottom';
					bSlider = true;
					active_slider = '';
				}
			});
		}
		else if(active_slider != '') {
		
			Effect.SlideUp(active_slider, { 
				beforeStart : function() { 
					bSlider = false; 
				}, 
				duration: 0.50,
				afterFinish : function() { 
					bSlider = true; 
					$('bg_'+active_slider).style.background = 'url(images/templates/line_slider.gif) repeat-x left bottom';
					$(active_slider + '_pijl').innerHTML = '<img src="images/templates/pijltje_faq_dicht.gif" />';
				}
			});
			
			Effect.SlideDown(id, { 
				beforeStart : function() { 
					bSlider = false;
				}, 
				duration: 0.50,
				delay: 0.5,
				afterFinish : function() { 
					$(id+'_pijl').innerHTML = '<img src="images/templates/pijltje_faq_open.gif" />'; 
					$('bg_'+id).style.background = ''; 
					bSlider = true;
					active_slider = id;
				}
			});
			
		}
		else
		{
			Effect.SlideDown(id, { 
				beforeStart : function() { 
					bSlider = false;
				},
				duration: 0.50,
				afterFinish : function() { 
					$(id+'_pijl').innerHTML = '<img src="images/templates/pijltje_faq_open.gif" />'; 
					$('bg_'+id).style.background = ''; 
					bSlider = true;
					active_slider = id;
				}
			});
		}
	}
}