function Check()
{
if( eval(document.forms['xxx'].elements[0].value) == 13 )
{
alert("Correct!");
}
else
{
if( eval(document.forms['xxx'].elements[0].value) == -13 )
{
alert("How many feet BELOW the surface is Shark?");
}
else
{
alert("Incorrect, try again.");
}
}
return false;
}