var current_num = -1;
var max_num = 100;
var mac_do = true;


var KC = {
	enter: 13,
	left : 37,
	down: 40,
	up : 38,
	right: 39
};

function keydown( c ) {
	switch( c ){
	case KC.up : select( -1, true );break;
	case KC.down: select( 1, true );break;
	case KC.enter: goto_page();break;
	default: search( d.getElementById('search_box').value );break;
	}
}

function select( num, from_key ) {
    if ( w.navigator.userAgent.indexOf("Safari") != -1 && w.navigator.platform.indexOf("Mac") != -1 && from_key ) {
    	if ( mac_do ) {
	       mac_do = false;
    	} else {
    	    mac_do = true;
    	}
    }
    if ( d ) {
        if ( current_num != -1 ) {
	    d.getElementById('cat' + current_num).className='cat-over';

        }
        if ( mac_do ) {
        	current_num += num;
        }
	max_num = document.getElementById( 'result' ).getElementsByTagName( 'li' ).length - 1;
        if ( current_num > max_num ) {
        	current_num = 0;
        } else if ( current_num < 0 ) {
        	current_num = max_num;
        }
        d.getElementById('cat' + current_num).className='cat-over cat-here';
    }
}

function goto_page() {
    if ( d ) {
        if ( current_num != -1 ) {
	    var a = d.getElementById('cat' + current_num).getElementsByTagName('a');
	    //            window.location = d.getElementById('cat' + current_num).href;
	    window.location = a[0].href;
        } else {
            search( d.getElementById('search_box').value );
        }
    }
}