//----------------
// set_on
//----------------
function set_on( L_id )
{
	var DEL_STR = "_off";
	var ADD_STR = "_on";
	var obj;
	var path;
	var fileName;
	var works;
	var work;
	var pos;
	
	
	if( L_id.length < 1 )
	{
		return( false );
	}
	
	obj = document.getElementById( L_id );
	
	path = k_getPath( obj.src );
	fileName = k_getFileName( obj.src );
	works = fileName.split( "." );
	
	pos = works[0].lastIndexOf( DEL_STR );
	work = works[0].substring( 0, pos );

	fileName = work + ADD_STR + "." + works[1];

	obj.src = path + fileName;
	
	
}