function select_deselect () {
	if (document.getElementById('select_tems').disabled==true) {
		document.getElementById('select_tems').disabled=false;
	} else {
		document.getElementById('select_tems').disabled='disabled';	
	}
}

jsHover = function() {
	var hEls = document.getElementById("nav_left").getElementsByTagName("li");
	for (var i=0, len=hEls.length; i<len; i++) {
		hEls[i].onmouseover=function() { this.className+=" jshover"; }
		hEls[i].onmouseout=function() { this.className=this.className.replace(" jshover", ""); }
	}
}
if (window.attachEvent && navigator.userAgent.indexOf("Opera")==-1) window.attachEvent("onload", jsHover);