function checkfields1(){
	if (document.forms["item1"].os1.value==""){
		alert ("Please choose a color.");
		return false;
	}
}
function checkfields2(){
	if (document.forms["item2"].os1.value==""){
		alert ("Please choose a color.");
		return false;
	}
}
function checkfields3(){
	if (document.forms["item3"].os1.value==""){
		alert ("Please choose a color.");
		return false;
	}
}
function checkfields4(){
	if (document.forms["item3"].os1.value==""){
		alert ("Please choose a color.");
		return false;
	}
}