/***************************************
Tastaturereignis auf Button
***************************************/
function button_keyPress(ev){
	if(ev==null) ev = window.event;
	var src = ev.target ? ev.target : ev.srcElement;
	
	
	if( src!=null && src.tagName=="SPAN" ){
		var cc = ev.which != null ? ev.which : ev.keyCode;
		if(cc==13 || cc==32){
			ev.returnValue = false;
			ev.cancelBubble = true;
			if(src.fireEvent){
				src.fireEvent("onclick");
			}else{
				src.onclick(ev);
			}
		}
	}
}