<!-- script type='text/javascript' -->
var myrules = {
        '#rain_image' : function(element){
            element.onclick = function(){
                //alert('sfdsd');
                //return false;
            }
        },
        '.subtemps1' : function(element){
            element.onclick = function(){
                //alert(element.innerHTML);
                return true;
            }
        },
        '.subtemps2' : function(element){
            element.onclick = function(){
                inputs = document.getElementById('subtemps').getElementsByTagName('td');
                for( var x in inputs){
                    if ((inputs[x].className == 'subtemps2')){
                        var old_html = inputs[x].innerHTML.replace(/&nbsp;/g,' ');
                        inputs[x].innerHTML = inputs[x].title.replace(/ /g,'&nbsp;');
                        inputs[x].title = old_html;
                    }
                }
                if ($('weatherStatsHeading').innerHTML == ('Current&nbsp;Temperatures')) {
                    $('weatherStatsHeading').innerHTML = 'Wind&nbsp;Speed&nbsp;(km/h)';
                } else {
                    $('weatherStatsHeading').innerHTML = 'Current&nbsp;Temperatures';
                }
                return true;
            }
        },
        '.Viewbank' : function(element){
            element.onmouseover = function(){
                element.style.cursor ='pointer';
                var el =  document.getElementById('chart');
                if (el.innerHTML == '') {
                    //element.title='Show Viewbank Temperature chart for last 48 hours';
                } else {
                    //element.title='Hide Viewbank Temperature chart';
                }

            }
            element.onclick = function(){
                var el =  document.getElementById('chart');
                if (el.innerHTML == '') {
                    var d = new Date();
                    var current_time = d.getTime();
                    el.style.position = 'absolute';
                    el.style.left = '100px';
                    el.style.top = '250px';
                    el.style.width = '700px';
                    el.style.height ='200px';
                    el.innerHTML =  "<img title='Viewbank Temperatures for last 48 hours' alt='Viewbank Temperatures for last 48 hours' src='http://www.ziguras.com/mrtg/weather/index-day.png?t="+current_time+"'>";
                    new Draggable('chart');
                    //element.title='Hide Viewbank Temperature chart';
                    return false;
                } else {
                    el.innerHTML = '';
                    //element.title='Show Viewbank Temperature chart for last 48 hours';
                }
            }
        }
};

    Behaviour.register(myrules);
    Behaviour.apply();
<!-- /script -->