var DXagent = navigator.userAgent.toLowerCase();
var DXopera = (DXagent.indexOf("opera") > -1);
var DXsafari = DXagent.indexOf("safari") > -1;
var DXie = (DXagent.indexOf("msie") > -1 && !DXopera);
var DXns = (DXagent.indexOf("mozilla") > -1 || DXagent.indexOf("netscape") > -1 || DXagent.indexOf("firefox") > -1) && !DXsafari && !DXie && !DXopera;

function DXattachEventToElement(element, eventName, func) {
    if(DXns || DXsafari)
        element.addEventListener(eventName, func, true);
    else {
        if(eventName.toLowerCase().indexOf("on") != 0) 
            eventName = "on"+eventName;
        element.attachEvent(eventName, func);
    }
}
function DXGetElement(id) {
    if(document.getElementById != null) {
        return document.getElementById(id);
    }
    if(document.all != null) {
        return document.all[id];
    }
    if(document.layers != null) {
        return document.layers[id];
    }
    return null;
}
function DXGetElementHeight(id) {
    var el = DXGetElement(id);
    if(el) {
        return parseInt(el.offsetHeight);
    }
    return 0;
}

function DXGetWindowHeight() {
    var height = 0;
    if(typeof(window.innerHeight) == 'number') {
	    height = window.innerHeight;
    } else if(document.documentElement && document.documentElement.clientHeight) {
    	height = document.documentElement.clientHeight;
    } else if(document.body && document.body.clientHeight) {
	    height = document.body.clientHeight;                                                                                                                   
	}
    return parseInt(height);
}
function DXMoveFooter() { 
    var spacer = DXGetElement('Spacer');
    var newheight = DXGetWindowHeight() - (DXGetElementHeight('PageContent') - DXGetElementHeight('Spacer'));
    if(newheight < 1) newheight = 1;
    spacer.style.height = newheight + 'px';
}
function DXWindowOnResize(evt){
	DXMoveFooter();
}