function addTag(n){
	var tag = document.getElementsByName('tag[]');

	if(tag.length == n){

		var tag_area = document.getElementById('tag_area');

		var spans = document.createElement("span");	
		spans.className = "tag_c";
		var tag_span = tag_area.appendChild(spans);
		
		var cnt = n*1 + 1;
		tag_span.innerHTML = "<input type='text' name='tag[]' onMouseOut='roll_over_on(this);' onMouseOver='roll_over_off(this);' class='box_tag' onfocus='addTag("+cnt+");'>";
	}
}