function checkSeminari() {
    var errorColor="#FFFF00";
    var color="#FFFFFF";
    var msg = "";
    document.form1.firstname.style.background=color;
    document.form1.lastname.style.background=color;
    document.form1.institution.style.background=color;
    document.form1.city.style.background=color;
    document.form1.country.style.background=color;
    document.form1.email.style.background=color;

    if (document.form1.firstname.value == ""){ 
         alert("Mandatory field: First name!"); 
         document.form1.firstname.style.background=errorColor;
         document.form1.firstname.focus();
         return false;
    }
    if (document.form1.lastname.value == ""){ 
         alert("Mandatory field: Last name!"); 
         document.form1.lastname.style.background=errorColor;
         document.form1.lastname.focus();
         return false;
    }
    if (document.form1.institution.value == ""){ 
         alert("Mandatory field: Institution!"); 
         document.form1.institution.style.background=errorColor;
         document.form1.institution.focus();
         return false;
    }
    if (document.form1.city.value == ""){ 
         alert("Mandatory field: City!"); 
         document.form1.city.style.background=errorColor;
         document.form1.city.focus();
         return false;
    }
    if (document.form1.country.value == ""){ 
         alert("Mandatory field: Country!"); 
         document.form1.country.style.background=errorColor;
         document.form1.country.focus();
         return false;
    }
    if (document.form1.email.value == ""){ 
         alert("Mandatory field: Email!"); 
         document.form1.email.style.background=errorColor;
         document.form1.email.focus();
         return false;
    }
    if (!isEmail(window.document.form1.email.value)) {
		alert("Enter correct email address, please!");
        document.form1.email.style.background=errorColor;
        document.form1.email.focus();
        return false;
   }
}

function checkMembership() {
    var errorColor="#FFFF00";
    var color="#FFFFFF";
    var msg = "";
    document.form1.firstname.style.background=color;
    document.form1.lastname.style.background=color;
    document.form1.institution.style.background=color;
    document.form1.country.style.background=color;
    document.form1.email.style.background=color;
    document.form1.PersonalEmail.style.background=color;

    if (document.form1.firstname.value == ""){ 
         alert("Mandatory field: First name!"); 
         document.form1.firstname.style.background=errorColor;
         document.form1.firstname.focus();
         return false;
    }
    if (document.form1.lastname.value == ""){ 
         alert("Mandatory field: Last name!"); 
         document.form1.lastname.style.background=errorColor;
         document.form1.lastname.focus();
         return false;
    }
    if (document.form1.institution.value == ""){ 
         alert("Mandatory field: Institution!"); 
         document.form1.institution.style.background=errorColor;
         document.form1.institution.focus();
         return false;
    }
    if (document.form1.country.value == ""){ 
         alert("Mandatory field: Country!"); 
         document.form1.country.style.background=errorColor;
         document.form1.country.focus();
         return false;
    }
    if (document.form1.email.value == ""){ 
         alert("Mandatory field: Email!"); 
         document.form1.email.style.background=errorColor;
         document.form1.email.focus();
         return false;
    }
    if (!isEmail(window.document.form1.email.value)) {
		alert("Enter correct email address, please!");
        document.form1.email.style.background=errorColor;
        document.form1.email.focus();
        return false;
   }
    if (document.form1.PersonalEmail.value == ""){ 
         alert("Mandatory field: Personal Email!"); 
         document.form1.PersonalEmail.style.background=errorColor;
         document.form1.PersonalEmail.focus();
         return false;
    }
    if (!isEmail(window.document.form1.PersonalEmail.value)) {
		alert("Enter correct personal email address, please!");
        document.form1.PersonalEmail.style.background=errorColor;
        document.form1.PersonalEmail.focus();
        return false;
   }
}

function clearSeminari() {
    var color="#FFFFFF";
    var msg = "";
	document.form1.firstname.style.background=color;
	document.form1.lastname.style.background=color;
	document.form1.institution.style.background=color;
	document.form1.address.style.background=color;
	document.form1.city.style.background=color;
    document.form1.postcode.style.background=color;
	document.form1.country.style.background=color;
	document.form1.phonenumber.style.background=color;
	document.form1.fax.style.background=color;
	document.form1.email.style.background=color;
    document.form1.reset();
}