var obj;
var image_source;
document.getElementById("menuBtn").onmouseover = function (){
	mouse_action(this, "common/img/btn/btn_menu_o.gif");
}
document.getElementById("menuBtn").onmouseout = function (){
	mouse_action(this, "common/img/btn/btn_menu.gif");
}
document.getElementById("aboutBtn").onmouseover = function (){
	mouse_action(this, "common/img/btn/btn_about_o.gif");
}
document.getElementById("aboutBtn").onmouseout = function (){
	mouse_action(this, "common/img/btn/btn_about.gif");
}
document.getElementById("accessBtn").onmouseover = function (){
	mouse_action(this, "common/img/btn/btn_access_o.gif");
}
document.getElementById("accessBtn").onmouseout = function (){
	mouse_action(this, "common/img/btn/btn_access.gif");
}
document.getElementById("recruitBtn").onmouseover = function (){
	mouse_action(this, "common/img/btn/btn_recruit_o.gif");
}
document.getElementById("recruitBtn").onmouseout = function (){
	mouse_action(this, "common/img/btn/btn_recruit.gif");
}
document.getElementById("blogBtn").onmouseover = function (){
	mouse_action(this, "common/img/btn/btn_blog_o.gif");
}
document.getElementById("blogBtn").onmouseout = function (){
	mouse_action(this, "common/img/btn/btn_blog.gif");
}
document.getElementById("contactBtn").onmouseover = function (){
	mouse_action(this, "common/img/btn/btn_contact_o.gif");
}
document.getElementById("contactBtn").onmouseout = function (){
	mouse_action(this, "common/img/btn/btn_contact.gif");
}

/*document.getElementById("menuBtn").onmouseover = function (){
	mouse_action(this, "images/navi_over_menu.jpg");
}
document.getElementById("menuBtn").onmouseout = function (){
	mouse_action(this, "images/navi_menu.jpg");
}

*/function mouse_action(obj, image_source) {
	obj.setAttribute("src", image_source);
}