function PreloadBoerse(){
	if(document.images){
		var aXName = new Array('dax','tecdax','dow');
		aTabImg = new Array();
		aChart	= new Array();
		for(i=0;i<3;i++){
			aTabImg[i] = new Image(205,20);
			aTabImg[i].src = "http://www.spiegel.de/static/sys/v6/boersenreiter-"+aXName[i]+".gif";
			aChart[i] = new Image (196,91);
			aChart[i].src = "http://www.spiegel.de/static/sys/boerse/spiegeltrans_"+aXName[i]+".gif";
		}
	}
}
PreloadBoerse();

function showChart(index) {
	if(document.images){
		document.boerseTab.src = aTabImg[index].src;
		document.boerseChart.src = aChart[index].src;
	}
}