function imgRollOver(objImg){
	arrSrc = objImg.src.split('.')
	objSrc = arrSrc[0] + '_a.' + arrSrc[1];
	objImg.src = objSrc;
}

function imgRollOut(objImg){
	arrSrc = objImg.src.split('.')
	objSrc = objImg.src.replace('_a.','.');
	objImg.src = objSrc;
}


function checkForm(){
	tmp = document.forms['form_contact'].elements['message'];
	if(tmp.value.length <= 0){
		alert('Bitte Nachricht eingeben');
		tmp.focus();
		return false;
	}else{
		return true;
	}
}