function moveWarenkorb() {

	var wk = document.getElementById("wk_sidebar");
	var dont_scroll = document.getElementById("fix_wk_sidebar");
	
	if(wk != undefined && dont_scroll == undefined) {

		var x,y;
		var topMargin = 140;
	
		if (self.pageYOffset) { // all except Explorer
  			y = self.pageYOffset;
  		}
		else if (document.documentElement && document.documentElement.scrollTop) { // Explorer 6 Strict
			y = document.documentElement.scrollTop;
		}
		else if (document.body) { // all other Explorers
			y = document.body.scrollTop;
		}
	
		if(y > topMargin) {
		topMargin = 0; //bigger offset only needed on top of page (because of header)
		}
		//alert("hallo - "+ x + ', '+y);
		var offset = y + topMargin;
	
		wk.style.position="absolute";
		wk.style.top= offset + 'px';
		wk.style.left="610px";
	}
}