function cardnoa()
{
	var strlen;
	
	strlen = document.viewacc.cardnoa.value.length();
	
	if(strlen == 4)
	{
		document.viewacc.cardnob.focus();
	}
}

function cardnob()
{
	var strlen;
	
	strlen = document.viewacc.cardnob.value.length();

	if(strlen == 4)
	{
		document.viewacc.cardnoc.focus();
	}
}

function cardnoc()
{


}

function cardnod()
{
	var strlen;
	
	strlen = document.viewacc.cardnod.value.length;

	if(strlen == 4)
	{
		document.viewacc.password.focus();
	}
}

function writeAutoTabInput(name,size,maxlength,value,clas,extras,layer)
{
//	size = convertSize(size,"input");
	var props = ' name="'+name+'" size="'+size+'" maxlength="'+maxlength+'"'+ ((value)?' value="'+value+'"':'') +  ((clas)?' class="'+clas+'"':'') + ((extras)?extras:'') ;
	var doc = document;
	if (layer != null && document.layers && layer != "" ) 
	{
		if (typeof(layer) == 'object') doc = layer.document;
		else if (typeof(layer) == 'string') doc = eval('document.layers.' + layer + '.document');
    }
	doc.writeln('<input type="text" onKeyUp="return autoTab(this, 4, event);" '+props+'>');
}

function containsElement(arr, ele) {
	var found = false, index = 0;
	while(!found && index < arr.length)
		if(arr[index] == ele)
			found = true;
		else
			index++;
	return found;
}

function getIndex(input) {
	var index = -1, i = 0, found = false;
	while (i < input.form.length && index == -1)
		if (input.form[i] == input)index = i;
		else i++;
	return index;
}

function autoTab(input,len, e) {
	var isNN = (navigator.appName.indexOf("Netscape")!=-1);
	var keyCode = (isNN) ? e.which : e.keyCode;
	var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
	if(input.value.length >= len && !containsElement(filter,keyCode)) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
	}

	return true;
}