function changeyear(){
	j=1;
	var yrlist = document.forms[0].elements[0];
	var mklist = document.forms[0].elements[1];
	for (i = 0; i < yr.length; i++){
		if (yrlist.options[yrlist.selectedIndex].value == yr[i]){
			j++;
			mklist.length=j;
			mklist.options[j-1].text = mk[i];
			mklist.options[j-1].value = urlmk[i];
			if (make == mk[i]){
				mklist.options[j-1].selected = true;
			}
		}
	}
}

function checkyear(){
	var yrlist = document.forms[0].elements[0];
	var mklist = document.forms[0].elements[1];
	if (yrlist.options[yrlist.selectedIndex].value == 0){
		alert('Please select a year before selecting a make.');
		yrlist.focus();
		return false;
	}
	if (mklist.options[mklist.selectedIndex].value == 0){
		alert('Please select a make.');
		mklist.focus();
		return false;
	}
	location.href='search.cfm?sYear='+yrlist.options[yrlist.selectedIndex].value+'&sMake='+mklist.options[mklist.selectedIndex].value;
}