function validate_required(field,alerttxt){
with (field){
	if (value==null||value==""||value=="-"){
		alert(""+alerttxt);
		return false;
	}
	else {
		return true;
	}
}
}



function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@");
dotpos=value.lastIndexOf(".");
lastpos=value.length-1;
if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2){
	alert("" +alerttxt);
	return false;}
else {return true}
}
}


function kontrola(thisform)
{
with (thisform)
{


if (validate_required(FirstName,"Please fill in your Name")==false){FirstName.focus();return false}
if (validate_required(LastName,"Please fill in your Name")==false){LastName.focus();return false}
if (validate_email(Email,"Wrong Email format")==false){Email.focus();return false}



if(thisform.odosielam.value == "Odoslať"){
	thisform.odosielam.value = "Odosielam...";
	thisform.odosielam.disabled = true;
	return true;
}


}

}