function bookmark(preNav,preCon,currentNum)
{
	
	var obj_nav ;
	var obj_con ;
	var i = 1 ;

	
	while (i>0)
	{
		try {
		
			obj_nav = document.getElementById( preNav + i);
			obj_con = document.getElementById( preCon + i);
			
			if ( currentNum == i ){
				obj_nav.className= "on";
				obj_con.style.display= "";
				
			}else{
				obj_nav.className= "";
				obj_con.style.display= "none";
			}
			
			i ++ ;
		
		} catch (e) {
		  break ;	
		}
		
	}

}