n-nodes recursive tree

Hi, I have an xml file which looks pretty much like this:
<tree>
	<node>
		<id>1</id>
		<parent>root</parent>
		<node>
			<id>4</id>
			<parent>1</parent>
		</node>
		<node>
			<id>5</id>
			<parent>1</parent>
			<node>
				<id>7</id>
				<parent>5</parent>
			</node>
		</node>
	</node>
	<node>
		<id>2</id>
		<parent>root</parent>
		<node>
			<id>6</id>
			<parent>2</parent>
		</node>
	</node>
	<node>
		<id>3</id>
		<parent>root</parent>
	</node>
</tree>

In effect, i will never know the max number of levels in tree node, and so i'd like to obtain an html file formated with xsl and wich looks like that:

Tree
    ---- 1
	    ---- 4
	    ---- 5
		    ---- 7
    ---- 2
	    ---- 6
    ---- 3
	
I don't know recursive tools that provides XSLT and if there is anyway to do that. Does anybody know what can i do about this? 

Thanks very much,

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list