var done = [];


function clean(id) 
{
	
	
	if(array_find(done, id) == -1)
	{
		done.push(id);
	
		var fields = document.getElementById(id);
		fields.value = '';
		fields.focus();
	}
}


function array_find(array_, string)
{
	if(!Array.indexOf)
	{
		for (var i = 0; i < array_.length; i++)
		{
			if (array_[i] == string) 
				return i;
		}
		return -1;
	}
	else
		return array_.indexOf(string);
}