function prefixBlankCheck()
{
	if(document.getElementById("prefixChanged").value == 'false')
	{
		blankPrefix();
	}
}

function currentBlankCheck()
{
	if(document.getElementById("currentChanged").value == 'false')
	{
		blankCurrent();
	}
}

function blankPrefix()
{
	document.getElementById("prefix_prefix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("prefix_number_1").src = 'http://www.carreg.co.uk/images/plates/any_number.gif';
	document.getElementById("prefix_number_1").width = 27;
	document.getElementById("prefix_number_2").src = 'http://www.carreg.co.uk/images/plates/any_number.gif';
	document.getElementById("prefix_number_2").width = 27;
	document.getElementById("prefix_number_3").src = 'http://www.carreg.co.uk/images/plates/any_number.gif';
	document.getElementById("prefix_number_3").width = 27;
	document.getElementById("prefix_suffix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("prefix_suffix_2").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("prefix_suffix_3").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("prefixChanged").value = 'true';
}

function blankCurrent()
{
	document.getElementById("current_prefix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("current_prefix_2").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("current_number_1").src = 'http://www.carreg.co.uk/images/plates/any_number.gif';
	document.getElementById("current_number_1").width = 27;
	document.getElementById("current_number_2").src = 'http://www.carreg.co.uk/images/plates/any_number.gif';
	document.getElementById("current_number_2").width = 27;
	document.getElementById("current_suffix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("current_suffix_2").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("current_suffix_3").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	document.getElementById("currentChanged").value = 'true';
}

updateSuffixPrefix();
updatePrefixPrefix();
function updatePrefixPrefix()
{
	prefixBlankCheck();
	if(document.getElementById("prefix_prefix").value == '')
	{
		document.getElementById("prefix_prefix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("prefix_prefix_1").src = 'http://www.carreg.co.uk/images/plates/' + document.getElementById("prefix_prefix").value + '.gif';
	}
}
function updateSuffixPrefix()
{
	prefixBlankCheck();
	aChar = isAlpha(document.getElementById("prefix_suffix").value.toUpperCase(), 'prefix');
	if(aChar > 0)
	{
		alert('Please enter letters only excluding I, Q & Z');
		var newString = '';
		for(i = 0; i < aChar - 1; i++)
		{
			newString += document.prefixForm.prefix_suffix.value.charAt(i);
		}
		document.getElementById("prefix_suffix").value = newString;
	}
	if(document.prefixForm.prefix_suffix.value.charAt(0) == '')
	{
		document.getElementById("prefix_suffix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("prefix_suffix_1").src = 'http://www.carreg.co.uk/images/plates/' + document.prefixForm.prefix_suffix.value.charAt(0).toUpperCase() + '.gif';
	}
	if(document.prefixForm.prefix_suffix.value.charAt(1) == '')
	{
		document.getElementById("prefix_suffix_2").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("prefix_suffix_2").src = 'http://www.carreg.co.uk/images/plates/' + document.prefixForm.prefix_suffix.value.charAt(1).toUpperCase() + '.gif';
	}
	if(document.prefixForm.prefix_suffix.value.charAt(2) == '')
	{
		document.getElementById("prefix_suffix_3").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("prefix_suffix_3").src = 'http://www.carreg.co.uk/images/plates/' + document.prefixForm.prefix_suffix.value.charAt(2).toUpperCase() + '.gif';
	}
}

updateNumberCurrent(document.getElementById("current_number").value);
updateSuffixCurrent();
updatePrefixCurrent();
function updatePrefixCurrent(prefixCurrent)
{
	currentBlankCheck();
	if(prefixCurrent != null)
	{
		if(prefixCurrent.charAt(0) == '')
		{
			document.getElementById("current_prefix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
		}
		else
		{
			document.getElementById("current_prefix_1").src = 'http://www.carreg.co.uk/images/plates/' + prefixCurrent.charAt(0) + '.gif';
		}
		if(prefixCurrent.charAt(1) == '')
		{
			document.getElementById("current_prefix_2").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
		}
		else
		{
			document.getElementById("current_prefix_2").src = 'http://www.carreg.co.uk/images/plates/' + prefixCurrent.charAt(1) + '.gif';
		}
	}
}
function updateSuffixCurrent()
{
	currentBlankCheck();
	aChar = isAlpha(document.currentForm.current_suffix.value.toUpperCase(), 'current');
	if(aChar > 0)
	{
		alert('Please enter letters only excluding I & Q');
		var newString = '';
		for(i = 0; i < aChar - 1; i++)
		{
			newString += document.currentForm.current_suffix.value.charAt(i);
		}
		document.getElementById("current_suffix").value = newString;
	}
	if(document.currentForm.current_suffix.value.charAt(0) == '')
	{
		document.getElementById("current_suffix_1").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("current_suffix_1").src = 'http://www.carreg.co.uk/images/plates/' + document.currentForm.current_suffix.value.charAt(0).toUpperCase() + '.gif';
	}
	if(document.currentForm.current_suffix.value.charAt(1) == '')
	{
		document.getElementById("current_suffix_2").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("current_suffix_2").src = 'http://www.carreg.co.uk/images/plates/' + document.currentForm.current_suffix.value.charAt(1).toUpperCase() + '.gif';
	}
	if(document.currentForm.current_suffix.value.charAt(2) == '')
	{
		document.getElementById("current_suffix_3").src = 'http://www.carreg.co.uk/images/plates/any_letter.gif';
	}
	else
	{
		document.getElementById("current_suffix_3").src = 'http://www.carreg.co.uk/images/plates/' + document.currentForm.current_suffix.value.charAt(2).toUpperCase() + '.gif';
	}
}

updateNumbers();

document.getElementById("prefix_prefix_1").src = 'http://www.carreg.co.uk/images/plates/S.gif';
document.getElementById("prefix_number_1").src = 'http://www.carreg.co.uk/images/plates/7.gif';
document.getElementById("prefix_number_2").src = 'http://www.carreg.co.uk/images/plates/_.gif';
document.getElementById("prefix_number_3").src = 'http://www.carreg.co.uk/images/plates/_.gif';
document.getElementById("prefix_suffix_1").src = 'http://www.carreg.co.uk/images/plates/J.gif';
document.getElementById("prefix_suffix_2").src = 'http://www.carreg.co.uk/images/plates/D.gif';
document.getElementById("prefix_suffix_3").src = 'http://www.carreg.co.uk/images/plates/W.gif';

document.getElementById("current_prefix_1").src = 'http://www.carreg.co.uk/images/plates/O.gif';
document.getElementById("current_prefix_2").src = 'http://www.carreg.co.uk/images/plates/O.gif';
document.getElementById("current_number_1").src = 'http://www.carreg.co.uk/images/plates/0.gif';
document.getElementById("current_number_2").src = 'http://www.carreg.co.uk/images/plates/6.gif';
document.getElementById("current_suffix_1").src = 'http://www.carreg.co.uk/images/plates/J.gif';
document.getElementById("current_suffix_2").src = 'http://www.carreg.co.uk/images/plates/D.gif';
document.getElementById("current_suffix_3").src = 'http://www.carreg.co.uk/images/plates/W.gif';

document.getElementById("prefixChanged").value = 'false';
document.getElementById("currentChanged").value = 'false';