var val_current = 75;		// der aktuelle Negative Anzeigewert
var val_max = 100;		// Maximalwert der Skala

var box_bgimage = 'http://www.dtwow.eu/images/spenden_bg.png';	// Pfad zum Hintergrundbild
var box_width = 167;		// Breite der Box in px
var box_height = 25;		// Hoehe der Box in px

var left = 0;
var left_end = parseInt((val_current/val_max)*box_width);

function Barometer() {
	node = document.getElementById("barometerBox");
	elem = node.getElementsByTagName("img")[0];
	
	node.style.backgroundImage = 'url('+box_bgimage+')';
	node.style.width = parseInt(box_width) + 'px';
	node.style.height = parseInt(box_height) + 'px';
	  
    if (left < left_end) {
		elem.style.clip='rect(auto '+left+'px auto auto)';
		left++;
    } else
        window.clearInterval(sb_Timer);        

}