function getObj(obj){
	return (o = document.getElementById(obj))? o : document.all[obj];
}

function _proxy(obj) {
	if(!window.ch1 || !window.ch2) {
		ch1 = getObj('chk_row1');
		ch2 = getObj('chk_row2');
	}
	var prop = 'display';
	var state = (obj.checked) ? 'block' : 'none';
	ch1.style[prop] = state;
	ch2.style[prop] = state;
}