function nextTab(input,len, e) 
{
	try
	{
		if(input.value.length >= len) {
		input.value = input.value.slice(0, len);
		input.form[(getIndex(input)+1) % input.form.length].focus();
	}	
		return true;
	}
	catch(e){}
}
function getIndex(input) 
{
	try{	
		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;
	}catch(e){}
}