function $id(id){

	return document.getElementById(id);

}

function basemenu(num){

	$id('topmenusum').style.backgroundPosition = '0 -'+ (num*35) +'px';

}

function initmenu(num){

	$id('topmenu').onmouseout = new Function("basemenu(0)");
	$id('sum1').onmousemove = new Function("basemenu(1)");
	$id('sum2').onmousemove = new Function("basemenu(2)");
	$id('sum3').onmousemove = new Function("basemenu(3)");
	$id('sum4').onmousemove = new Function("basemenu(4)");
	$id('sum5').onmousemove = new Function("basemenu(5)");
	$id('sum6').onmousemove = new Function("basemenu(6)");
	$id('sum7').onmousemove = new Function("basemenu(7)");

}

window.onload = initmenu;