<xsl:template match ="forecast">
...
</xsl:template>

<script language="JavaScript">
<![CDATA[
function setblock(obj)
{
		if (obj.style.display=='none')
		{
        	obj.style.display='block';
        }
        else
        {
        	obj.style.display='none';
        }
        obj.style.cursor='hand';
        obj.style.color='green';
}

function changeObjVis(object, value) {
	if (object && object.style && object.style.display) {
		object.style.display = object.id == value ? "block" : "none";
	}
}
function changeVisibility(value) {
	changeObjVis(window.document.getElementById('obj1'), value);
}
changeVisibility(window.document.getElementById('selector').value);
]]>
</script>

<input type="button" value="нажми меня1" OnClick="setblock(obj1)"/>
<div id="obj1" style="display:block;"> 123 
</div>

<SCRIPT LANGUAGE="javascript" DEFER="true">
     <xsl:comment>
      <![CDATA[ 
	function hiLite()
 	 {
	   alert("hello");
   	 }
      ]] > 
    </xsl:comment>
</SCRIPT>