window.onload=function(){
	if(document.getElementsByTagName('table').length>0)altTableRows();
}
function altTableRows(){
	if (!document.getElementById) return;
	var r=document.getElementsByTagName('tr');
	var l=r.length;
	for (i=0;i<l;i++){if (i%2==1){} else {r[i].className='altrow';}}
}
function checkFields(whichField,whichPhrase){
	if (!document.getElementById) return;
	if ((document.getElementById(whichField).value==whichPhrase)||(document.getElementById(whichField).value=='')){
		alert('Bitte füllen Sie das aktive Feld aus.');
		document.getElementById(whichField).focus();
		return false;
	}
}