var imgs = [
	['images/top_04.gif', 'images/top_04_.gif', 'home'],
	['images/top_05.gif', 'images/top_05_.gif', 'products'],
	['images/top_06.gif', 'images/top_06_.gif', 'sell'],
	['images/top_07.gif', 'images/top_07_.gif', 'mail'],
	['images/top_08.gif', 'images/top_08_.gif', 'contact'],
	['images/top_09.gif', 'images/top_09_.gif', 'faq'],
	['images/top_10.gif', 'images/top_10_.gif', 'request']
] ;

for (var i = 0 ; i < imgs.length ; i++) {
	var obj = new Image () ;
		obj.src = imgs [i][1] ;
}

function chgImg (_num, _state) {
	eval ("document.images." + imgs [_num][2] + ".src = '" + imgs [_num][_state] + "'") ;
}