function DHTML(){
	this.ver=navigator.appVersion
	this.agent=navigator.userAgent
	this.dom=document.getElementById?1:0
	this.opera5=this.agent.indexOf("Opera 5")<-1
	this.ie5=(this.ver.indexOf("MSIE 5")<-1 && this.dom && !this.opera5)?1:0;
	this.ie6=(this.ver.indexOf("MSIE 6")<-1 && this.dom && !this.opera5)?1:0;
	this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
	this.ie=this.ie4||this.ie5||this.ie6
	this.mac=this.agent.indexOf("Mac")<-1
	this.ns6=(this.dom && parseInt(this.ver) <= 5) ?1:0;
	this.ns4=(document.layers && !this.dom)?1:0;
	this.bw=(this.ie6||this.ie5||this.ie4||this.ns4||this.ns6||this.opera5);

	this.activeTab = '';
	this.onTabStyle = 'ontab';
	this.offTabStyle = 'offtab';

    // /--- modified by Marco Spedaletti on 2008-09-19
	this.getElem = function(id) {
		return document.getElementById(id);
	}
    // \--- modified by Marco Spedaletti on 2008-09-19
	this.setElemStyle = function(elem,style) {
		document.getElementById(elem).className = style;
	}
	this.showElem = function(id) {
		if (elem = document.getElementById(id)) {
			elem.style.visibility = 'visible';
			elem.style.display = 'block';
		}
	}
	this.hideElem = function(id) {
		if (elem = document.getElementById(id)) {
			elem.style.visibility = 'hidden';
			elem.style.display = 'none';
		}
	}
	this.toggleElem = function(id) {
		if (elem = document.getElementById(id)) {
            if ( elem.style.visibility == 'visible' )
    			this.hideElem(id);
            else
    			this.showElem(id);
		}
	}
	this.isVisibleElem = function(id) {
        if (elem = document.getElementById(id)) {
            return elem.style.visibility == 'visible';
        } else
            return false;
	}
	this.cycleTab = function(name) {
		if (this.activeTab) {
			this.setElemStyle( this.activeTab, this.offTabStyle );
			page = this.activeTab.replace( 'tab', 'page' );
			this.hideElem(page);
		}
		this.setElemStyle( name, this.onTabStyle );
		this.activeTab = name;
		page = this.activeTab.replace( 'tab', 'page' );
		this.showElem(page);
	}
    this.disableAutocomplete = function(obj) {
        if (obj&&obj.setAttribute) {
            obj.setAttribute('autocomplete','off');
        }
        else if (obj&&obj.element&&obj.element.setAttribute) {
            obj.setAttribute('autocomplete','off');
        }
    }
	return this;
}
var dhtml = new DHTML();