function show(index) {
    for (i = 1; i <= 21; i++) {
        var content = document.getElementById("content" + i);
        var nav = document.getElementById("nav" + i);
if(content == null) { break;}
         if (i == index) {
            content.style.display = "block";
            if (i <= 8)
                nav.className = "i_c1 i_font12g";
            else
                nav.className = "i_c2 d_font12g";

        } else {
            content.style.display = "none";
            if (i <= 8)
                nav.className = "i_c1";
            else
                nav.className = "i_c2";

        }
        if (index == 2 || (index >= 9 && index <= 14))
            content = document.getElementById("div1").style.display = "block";
        else
            content = document.getElementById("div1").style.display = "none";
        if (index == 4 || (index >= 15 && index <= 20))
            content = document.getElementById("div2").style.display = "block";
        else
            content = document.getElementById("div2").style.display = "none";
    }
};




function menuStyle(nub1, nub2, show) {
    for (var i = 1; i <= nub2; i++) {
		var ly =  document.getElementById("Layer" + i);
		if(ly == null) { break; }
         if (nub1 == i && show == "y") {
            ly.style.display = "block";
            document.getElementById("div_menu").style.display = "block";
        }
        else
            ly.style.display = "none";
    }
};


function menuSecShow(divID, falg) {
    var div_id = document.getElementById(divID);
    if (falg == '0')
        div_id.style.display = "block";
    else
        div_id.style.display = "none";

};
function senderUrl(htmlName,number) {
	if(!number) { number = 1; }
    window.location = htmlName + '.html?number=' + number;
}

function histback() {
    history.go(-1);

}