window.onload = function() {
	exInterestingEl = document.getElementById("exinteresting");
	
	//incase user refreshes with option selected (firefox)
	exAddDisplay(exInterestingEl);
	
	exInterestingEl.onchange = function () {
		exAddDisplay(this);
	}
}

function exAddDisplay(elToCheck) {
	if (elToCheck.options[elToCheck.selectedIndex].value == 0) {
		document.getElementById("exaddcontainer").style.display="block";
	}
	else {
		document.getElementById("exaddcontainer").style.display="none";
	}
}