function chgITEM(id, img) {
    document.getElementById(id).src = './images/' + img;
}

function content1() {
    document.getElementById("div1").style.display = "block";
    document.getElementById("div2").style.display = "none";
    document.getElementById("div3").style.display = "none";
}

function content2() {
    document.getElementById("div1").style.display = "none";
    document.getElementById("div2").style.display = "block";
    document.getElementById("div3").style.display = "none";
}

function content3() {
    document.getElementById("div1").style.display = "none";
    document.getElementById("div2").style.display = "none";
    document.getElementById("div3").style.display = "block";
}
    
function display() {
    document.getElementById("div1").style.display = "block";
    document.getElementById("div2").style.display = "none";
    document.getElementById("div3").style.display = "none";
}

//function MM_preloadImages() { //v3.0
//  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
//    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
//    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
//}