function checkfield4()
{
if(document.getElementById('Tname').value=='')
{
alert("Please enter your name");
document.getElementById('Tname').focus();
return false;
}


if(document.getElementById('Tphone').value=='')
{
alert("Please enter your phone");
document.getElementById('Tphone').focus();
return false;
}

if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/.test(document.getElementById("Temail").value))
{
alert("Please enter valid email address"); 
document.getElementById("Temail").focus();
return false;
}

if(document.getElementById('Tcompany').value=='')
{
alert("Please enter your companny");
document.getElementById('Tcompany').focus();
return false;
}

if(document.getElementById('Tposition').value=='')
{
alert("Please enter your position");
document.getElementById('Tposition').focus();
return false;
}

if(document.getElementById('Tmessage').value=='')
{
alert("Please enter your message");
document.getElementById('Tmessage').focus();
return false;
}
}