function fillCCInfo(selected) {
	if(selected == true) {
		document.getElementById('cc_name_first').value  = document.getElementById('ship_name_first').value;
		document.getElementById('cc_name_last').value = document.getElementById('ship_name_last').value;
		document.getElementById('cc_add').value = document.getElementById('ship_add').value;
		document.getElementById('cc_city').value = document.getElementById('ship_city').value;
		document.getElementById('cc_state').selectedIndex = document.getElementById('ship_state').selectedIndex;
		document.getElementById('cc_zip').value = document.getElementById('ship_zip').value;
		
		//Disable Elements
		changeEnabledState(false);

		//Focus on CC number field
		document.getElementById('cc_num').focus();
	} else {
		changeEnabledState(true);
	}
}

function checkSame() {
	fillCCInfo(document.getElementById('same_addr').checked);
}

function changeEnabledState(state) {
	if(state == null) {
		state = true;
	}
	document.getElementById('cc_name_first').disabled  = !state; 
	document.getElementById('cc_name_last').disabled  = !state;
	document.getElementById('cc_add').disabled  = !state;
	document.getElementById('cc_city').disabled  = !state;
	document.getElementById('cc_state').disabled  = !state;
	document.getElementById('cc_zip').disabled  = !state;
}

function submitForm() {
	if(validateForm()) {
		changeEnabledState(true);
		return true;
	} else {
		return false;
	}
	
}

function validateForm() {
	
	var reqElements = new Array(
		'ship_name_first','ship_name_last', 
		'ship_add', 'ship_city', 'ship_state', 
		'ship_zip', 'cc_name_first','cc_name_last', 
		'cc_add', 'cc_city', 'cc_state', 'cc_zip');
	
	for(var count = 0; count < reqElements.length; count++) {
		if(document.getElementById(reqElements[count]).value.length < 1){
			alert("You did not fill in a required element.");
			document.getElementById(reqElements[count]).focus();
			return false;
		}
	}
	if(!isEmail(document.getElementById('email').value)) {
		alert("You must supply a valid email address.");
		document.getElementById('email').focus();
		return false;
	}
	var cc_num = document.getElementById('cc_num').value;
	if(cc_num != parseInt(cc_num) || cc_num.length != 16) {
		alert("You must supply a valid credit card number.");
		document.getElementById('cc_num').focus();
		return false;
	}
	
	return true;
}

function isEmail(string) {
	if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
		return true;
	else
		return false;
}


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