function addComp(mod) {
var cStr = document.getElementById('newcompare').value
var checkStr = cStr+','
newStr = cStr + addMod
alert(checkStr.indexOf(mod+','));
if (checkStr.indexOf(mod+',') ==-1) {
	if (document.getElementById('newcompare').value.length > 0) {
		document.getElementById('newcompare').value+=',';
		}
	document.getElementById('newcompare').value+=mod;
	}
cStr = document.getElementById('newcompare').value;
alert(document.getElementById('newcompare').value);
}

function getChecked() {
var mList = ''
var boxes=document.getElementsByTagName('input')
for (var i = 0; i < boxes.length; i++){
if ((boxes[i].name=='itemcomp') && (boxes[i].checked)){
if (mList.length > 0) {
	mList=mList+','
		}
mList+=boxes[i].value;
	}
}
document.getElementById('newcompare').value = mList
if (mList.length > 0) {
	mList = ','+mList
	}
if (document.getElementById('oldcompare').value.length > 0) {
	document.getElementById('newcompare').value = document.getElementById('oldcompare').value + mList
	}
if (document.getElementById('newcompare').value.length > 0) {
	document.comp.submit();
	} else {
	alert('No items have been selected for comparison');
	}
}