function gestion_block(X_id){
	
	var block = document.getElementById(X_id + '_s');
	
	if(block)
	{
	    if(block.style.display != 'none')
	    {
		    block.style.display = 'none'
	    }
	    else
	    {
	        block.style.display = ''
	    }
	}			
}