if(document.images) {
	var about_off = new Image(); about_off.src ='images/home/btn_about_off.gif';
	var about_on = new Image(); about_on.src ='images/home/btn_about_on.gif';

	var spec_off = new Image(); spec_off.src ='images/home/btn_spec_off.gif';
	var spec_on = new Image(); spec_on.src ='images/home/btn_spec_on.gif';

	var war_off = new Image(); war_off.src ='images/home/btn_war_off.gif';
	var war_on = new Image(); war_on.src ='images/home/btn_war_on.gif';

	var con_off = new Image(); con_off.src ='images/home/btn_con_off.gif';
	var con_on = new Image(); con_on.src ='images/home/btn_con_on.gif';

	var rguide_off = new Image(); rguide_off.src ='images/home/btn_rguide_off.gif';
	var rguide_on = new Image(); rguide_on.src ='images/home/btn_rguide_on.gif';


                }
                function mOver(imgName) {
                        if(document.images) {
                                document.images[imgName].src = eval(imgName + '_on.src');
                        }
                }
                function mOut(imgName) {
                        if(document.images) {
                                document.images[imgName].src = eval(imgName + '_off.src');
                        }
                }