<!--for next and previous buttons -->
 var webPages = ["u1a1", "u1a2", "u1a3", "u1a4", "u1a5","u1a6"];
var fileNum = webPages.length;
current = 0;

function prev()
{
	currentURL = eval( "document.location" );
    for (i=0; i<fileNum; i++) {
    	currentPage = eval( "/" + webPages[i] + "/" );
        if (currentPage.test(currentURL)) {
        	current = i;
            }
         }
if (current > 0)
	document.location = webPages[current-1] + ".html"; 
    else
    alert("You are already at the Beginning of the Unit. To go to another unit, click on the SOTL home button in the upper left");
}
     
function next()
{
	currentURL = eval( "document.location" );
    for (i=0; i<fileNum; i++) {
    	currentPage = eval( "/" + webPages[i] + "/" );
        if (currentPage.test(currentURL)) {
        	current = i;
            }
         }
if (current < (fileNum-1))
	document.location = webPages[current+1] + ".html";
    else
    alert("You are at the end of this unit. Please take a momemt to complete  the Task. To continue to another unit, click on the SOTL HOME icon in the upper left.");
}

<!--for video and audio windows  -->
function openWindow(url, name, options) {
  popupWin = window.open(url, name, options)
}

<!-- preload images -->

<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

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) { //v4.0
  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 && document.getElementById) x=document.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->