document.domain="sbs.co.kr"

ns = (document.layers) ? 1:0;
ie = (document.all) ? 1:0;


var fl1 = new Image();
    fl1.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut01.gif";
var fl1_ = new Image();
    fl1_.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut01.gif";
var fl2 = new Image();
    fl2.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut02.gif";
var fl2_ = new Image();
    fl2_.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut02.gif";	
var fl3 = new Image();
    fl3.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut03.gif";
var fl3_ = new Image();
    fl3_.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut03.gif";
var fl4 = new Image();
    fl4.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut04.gif";
var fl4_ = new Image();
    fl4_.src = "http://img.sbs.co.kr/newimg/tv/firstlove/images/main_menut04.gif";

function showmenu(key) {

	if (ie) {
	
	if (key == 1) {
		document.fl1.src = fl1_.src;
		document.all.fb_mtop1.style.visibility = 'visible';
		}
	if (key == 2) {
		document.fl2.src = fl2_.src;
		document.all.fb_mtop2.style.visibility = 'visible';
		}
	if (key == 3) {
		document.fl3.src = fl3_.src;
		document.all.fb_mtop3.style.visibility = 'visible';
		}
	if (key == 4) {
		document.fl4.src = fl4_.src;
		document.all.fb_mtop4.style.visibility = 'visible';
		}
	}
	
	else {
	
	if (key == 1) {
		document.fl1.src = fl1_.src;
		document.layers.fb_mtop1.visibility = 'visible';
	    }
	if (key == 2) {
		document.fl2.src = fl2_.src;
		document.layers.fb_mtop2.visibility = 'visible';
	    }
	if (key == 3) {
		document.fl3.src = fl3_.src;
		document.layers.fb_mtop3.visibility = 'visible';
	    }
	if (key == 4) {
		document.fl4.src = fl4_.src;
		document.layers.fb_mtop4.visibility = 'visible';
		}
	}
}

function hidemenu(key) {

	if (ie) {
	
	if (key == 1) {
		document.fl1.src = fl1.src;
		document.all.fb_mtop1.style.visibility = 'hidden';
		}
	if (key == 2) {
		document.fl2.src = fl2.src;
		document.all.fb_mtop2.style.visibility = 'hidden';
		}
	if (key == 3) {
		document.fl3.src = fl3.src;
		document.all.fb_mtop3.style.visibility = 'hidden';
		}
	if (key == 4) {
		document.fl4.src = fl4.src;
		document.all.fb_mtop4.style.visibility = 'hidden';
		}
	}
		
	else {
	
	if (key == 1) {
		document.fl1.src = fl1.src;
		document.layers.fb_mtop1.visibility = 'hidden';
		}
	if (key == 2) {
		document.fl2.src = fl2.src;
		document.layers.fb_mtop2.visibility = 'hidden';
		}
	if (key == 3) {
		document.fl3.src = fl3.src;
		document.layers.fb_mtop3.visibility = 'hidden';
		}
	if (key == 4) {
		document.fl4.src = fl4.src;
		document.layers.fb_mtop4.visibility = 'hidden';
		}
	}
}