function check_subscription() {
	if((document.eingabe.email.value == "") || (document.eingabe.email.value == " ")) {
         	alert("please give a valid email-address!");
                 document.eingabe.email.focus();
                 return false;
         }

         if((document.eingabe.email.value.indexOf('@') == -1) || (document.eingabe.email.value.indexOf('.') == -1)) {
         	alert("please give a valid email-address!");
                 document.eingabe.email.focus();
                 return false;
         }

         if((document.eingabe.country.value == "") || (document.eingabe.country.value == " ")) {
         	alert("please submit your country!");
                 document.eingabe.country.focus();
                 return false;
         }

         if(document.eingabe.funct.selectedIndex == 0) {
         	alert("please provide your function");
                 document.eingabe.funct.focus();
                 return false;
         }
}