function PoinVisible(x,y){
	document.getElementById('sm1Point').style.left = x;
	document.getElementById('sm1Point').style.top = y;
	document.getElementById('sm1Point').style.visibility = 'visible';
}
function PoinHidden(){
	document.getElementById('sm1Point').style.visibility = 'hidden';
}
function CP(lName,Val){
	document.getElementById(lName).style.visibility = Val;
}
function CB(b1,b2){
	CP(b1,'visible');
	CP(b2,'hidden');
}