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connections.setup = function( drop_a, drop_b, drop_c ) {
     return this.register( 'primary', drop_a ) && this.register( 'secondary', drop_b ) && this.register( 'tertiary', drop_c );  
}
connections.register = function( type, drop ) {
    if ( drop != 'line' && drop != 'ship' & drop != 'region' ) { return false; }
    this[type] = {};
    this[type].type = drop;
    this[type].list = this[drop];
    this[type].drop = document.getElementById(drop + "id");
    this[type].drop.onchange = function(d) { return function() { connections.update( d ) } }(drop);
    this[type].drop.onkeyup = function(d) { return function() { connections.update( d ) } }(drop); 
    this[type].set = function( list ) {
        var dd = this.drop;
        var ddvalue = dd.value;
        dd.length = 0;
        dd.options[dd.options.length] = new Option( 'Any', '' );
        var opts = [];
        for ( var i in list ) {
            if ( this.list[i] ) { opts.push( [ i, this.list[i].name ] ) } ;
        }
        opts = opts.sort( function(a,b) { return a[1] < b[1] ? -1 : b[1] < a[1] ? 1 : 0 } );
        for ( var i = 0,o;o = opts[i]; i++ ) {
            dd.options[dd.options.length] = new Option( o[1], o[0] );
        }
        dd.value = ddvalue;
    }
    return true;
}
connections.update = function( drop ) {
    var list2 = this.secondary.list;
    var list3 = this.tertiary.list;
    if ( this.primary.type == drop ) {
        if ( this.primary.drop.value != '' ) { 
            list2 = this.primary.list[this.primary.drop.value][this.secondary.type];
            list3 = this.primary.list[this.primary.drop.value][this.tertiary.type];
        }
        this.secondary.set( list2 );
        this.tertiary.set( list3 );
    } else if ( this.secondary.type == drop ) {
         if ( this.secondary.drop.value != '' ) { list3 = this.secondary.list[this.secondary.drop.value][this.tertiary.type] }
         this.tertiary.set( list3 );
    }     
}
connections.initialise = function( values ) {
    values = values == null ? {} : values;
    var list = this.primary.list;
    this.primary.set(list);
    if ( values[this.primary.type] || this.primary.drop.value ) {
       this.primary.drop.value = values[this.primary.type] || this.primary.drop.value;
    }
    this.update( this.primary.type );
    if ( values[this.secondary.type] || this.secondary.drop.value ) {
       this.secondary.drop.value = values[this.secondary.type] || this.secondary.drop.value;
    } 
    this.update( this.secondary.type);
    if ( values[this.tertiary.type] || this.tertiary.drop.value ) {
       this.tertiary.drop.value = values[this.tertiary.type] || this.tertiary.drop.value;
    } 
}
connections.idfromname = function( listname, name ) {
    var list = this[listname];
    for ( var i =0,o;o = list[i];i++ ) {
        if ( name == o.name ) { return i }
    }
    return null;
}