/***** effets rideaux *****/

function show_bloc ( id ) 
{  
  var alltags = document.getElementsByTagName("div");
	reg =new RegExp('^rd_ctn_');
	for(i=0;i<alltags.length;i++)
		if ( reg.test(alltags[i].id)  && ( alltags[i].id != id ) )  
			alltags[i].style.display = "none";
			
	if ( id )		
	   if (document.getElementById( id ).style.display == "block")
		   document.getElementById( id ).style.display = "none" ;	
		else  
		    document.getElementById( id ).style.display = "block" ;			 
			 
}