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  • Javascript from DW

    I have been using Dreamweaver, but now i am getting into coding, and trying to reduce the content to non-content ratio of my sites.

    I have noticed that Dreamweaver puts this in! What is it and do I need it? Is it pre-load images?

    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];}}
    }

    function MM_findObj(n, d) { //v4.01
    var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
    if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
    for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
    if(!x && d.getElementById) x=d.getElementById(n); return x;
    }

    function MM_nbGroup(event, grpName) { //v6.0
    var i,img,nbArr,args=MM_nbGroup.arguments;
    if (event == "init" && args.length > 2) {
    if ((img = MM_findObj(args[2])) != null && !img.MM_init) {
    img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src;
    if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array();
    nbArr[nbArr.length] = img;
    for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
    if (!img.MM_up) img.MM_up = img.src;
    img.src = img.MM_dn = args[i+1];
    nbArr[nbArr.length] = img;
    } }
    } else if (event == "over") {
    document.MM_nbOver = nbArr = new Array();
    for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) {
    if (!img.MM_up) img.MM_up = img.src;
    img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])? args[i+1] : img.MM_up);
    nbArr[nbArr.length] = img;
    }
    } else if (event == "out" ) {
    for (i=0; i < document.MM_nbOver.length; i++) {
    img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; }
    } else if (event == "down") {
    nbArr = document[grpName];
    if (nbArr)
    for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; }
    document[grpName] = nbArr = new Array();
    for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
    if (!img.MM_up) img.MM_up = img.src;
    img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up;
    nbArr[nbArr.length] = img;
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