function submit_form()
{
var x_3=document.getElementById('message_table').rows[0].cells;
var x=document.getElementById('message_table').rows[1].cells;
var x_1=document.getElementById('message_table').rows[2].cells;
var x_2=document.getElementById('message_table').rows[3].cells;

var flag= 0;
var name= document.getElementById("name").value;
var email= document.getElementById("email").value;
var subject= document.getElementById("subject").value;
var message= document.getElementById("message").value;

if(name=="")
{
x_3[0].innerHTML="Name:* - Incomplete";
flag= 1;
}

else
{
x_3[0].innerHTML="Name:";
flag= 0;
}

if(email=="")
{
x[0].innerHTML="Email:* - Incomplete";
flag= 1;
}

else
{
x[0].innerHTML="Email:";
flag= 0;
}

if(subject=="")
{
x_1[0].innerHTML="Subject:* - Incomplete";
flag= 1;
}

else
{
x_1[0].innerHTML="Subject:";
flag= 0;
}

if(message=="")
{
x_2[0].innerHTML="Message:* - Incomplete";
flag= 1;
}
else
{
x_2[0].innerHTML="Message:";
flag= 0;
}


if(flag== 0)
{
if (email.indexOf("@")!=-1)
document.contactUs.submit();
else
{
alert("Please enter a valid email address!");
x[0].innerHTML="Email:* - Incorrect";
}
}
}