function checkempty() {
	var i,a=checkempty.arguments;

	for(i=0; i<a.length; i++)
		if (a[i]==""){
			alert("Please fill in \"" + a[i+1] + "\".");
			return false;
		}
}

function docheckall(alllist,addlist,alllist2,addlist2){
	if (addlist != null) {
		if (alllist.checked == true) {
			if (addlist.length == null) {
				addlist.checked = true;
				if (alllist2 != null) {
					addlist2.checked = false;
				}
			}
			else {
				for (i = 0; i < addlist.length; i++) {
					addlist[i].checked = true;
					if (alllist2 != null) {
						addlist2[i].checked = false;
					}
				}
			}
			if (alllist2 != null) {
				alllist2.checked = false;
			}
		}
		else {
			if (addlist.length == null) {
				addlist.checked = false;
			}
			else {
				for (i = 0; i < addlist.length; i++) {
					addlist[i].checked = false;
				}
			}
		}
	}
}

function docheck(addlist,addlist2,alllist,alllist2){
	if (addlist != null) {
		if (addlist.length == null) {
			addlist.checked = true;
			addlist2.checked = false;
		}
		else {
			for (i = 0; i < addlist.length; i++) {
				if (addlist[i].checked == true) {
					addlist2[i].checked = false;
				}
			}
		}
	alllist.checked = false;
	alllist2.checked = false;
	}
}