var hImgBank = new Array("shoulder.jpg","shake.jpg","script.jpg","meds.jpg","explan.jpg","fatherson.jpg","steth.jpg");
var pickArr = new Array();
var count = 0;

try {
  document.execCommand("BackgroundImageCache", false, true);
} catch(err) {}

function setMenuItemActive()  {
  var menu=document.getElementById("mainNavigation").getElementsByTagName("li")
  for (x=0;x<menu.length;x++) {
	y = menu[x].getElementsByTagName("a")[0].href //get link from each <li>
	if(y == location.href || location.href == "http://www.nchealthliteracy.org/") {
		menu[x].className = "active"
		break;
	}
	if(location.href == "http://nchealthliteracy.org/hfselfmanage.html") {
		menu[5].className = "active"
		break;
	}
	if(location.href == "http://nchealthliteracy.org/toolkit/") {
		menu[7].className = "active"
		break;
	}
  }
  randNum(4);
  for (var i=0; i < pickArr.length; i++) {
	document.images[i].src = "images/" + hImgBank[pickArr[i]];
  }
}

//path without file name
//a[0].href.substring(0,(a[0].href.lastIndexOf("/")+1))
//just file name
//a[0].href.substr(lastIndexOf("/"))



function displayPix() {
	//load up all the pictures in array
	//Array("","","","")
	//display a random 4
	//as added feature keep track of what view has seen
	//also work on handling different sized pictures
}

function randNum(num) {
	while (pickArr.length < num) {
		var doFlag = false;
		var currNum = Math.floor(Math.random()*hImgBank.length);
		if(count!=0) {
			//need to see if this number has already been picked
			for(var t=0; t<pickArr.length; t++) {
				if(currNum==pickArr[t]) {
					doFlag=true;
					break;
				}
			}
		}
		if(!doFlag) {
			pickArr[count] = currNum;
			count+=1;
		}
	}
}