//�⍇��
function contactRollover() {
	document.getElementById("bt_contact").onmouseover = function() {
		document.getElementById("bt_contact").setAttribute("src", "./images/bt_contact_over.png");
	}
	document.getElementById("bt_contact").onmouseout = function() {
		document.getElementById("bt_contact").setAttribute("src", "./images/bt_contact.png");
	}
}
if(window.addEventListener) {
	window.addEventListener("load", contactRollover, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", contactRollover);
}