function submitForms() { 
if ( isEmail() && isTemat() && isTresc()) {
return true;
}
else
{
return false;
} 
}

function isEmail() {
if (document.forms[0].elements[1].value == "") {
alert ("\n Field E-mail is empty. \n\n Please enter your E-mail address.")
document.forms[0].elements[1].focus();
return false;
}
if (document.forms[0].elements[1].value.indexOf ('@',0) == -1 || document.forms[0].elements[1].value.indexOf ('.',0) == -1) {
alert ("\n Wrong E-mail address. \n\nPlease reenter E-Mail address.")
document.forms[0].elements[1].select();
document.forms[0].elements[1].focus();
return false;
}
return true;
}

function isTemat() {
if (document.forms[0].elements[2].value == "") {
alert ("\n Field Subject is empty. \n\n Please write Subject.")
document.forms[0].elements[2].focus();
return false;
}
return true;
}

function isTresc() {
if (document.forms[0].elements[3].value == "") {
alert ("\n Field Message is empty. \n\nPlease fill this field")
document.forms[0].elements[3].focus();
return false;
}
return true;
}