var init, ddlState, fldZip, ddlCountry;

init = function() {
	ddlCountry = (document.getElementById) ? document.getElementById('country') : document.all('country');
	ddlState = (document.getElementById) ? document.getElementById('state') : document.all('state');
	fldZip = (document.getElementById) ? document.getElementById('zipcode') : document.all('zipcode');
}

function checkUSfields () {
	if(ddlCountry.options[ddlCountry.selectedIndex].value == "USA" || ddlCountry.options[ddlCountry.selectedIndex].value == ""){
		
		ddlState.disabled = false;
		fldZip.disabled = false;
	}
	else {
		ddlState.options[0].selected = true;
		ddlState.disabled = true;
		fldZip.disabled = true;
	}
}

window.onload = function () {
	init();
}