function second_question(){ var x = document.getElementById("how_did_you_find_us").value; 

if (x=="Search engine"){document.getElementById("search_engine").style.display = "inline";}
else {document.getElementById("search_engine").style.display = "none"}
} 

function validateForm()
    {var patt = /[^a-zA-Z0-9_]/;
	if (document.getElementById('name').value == "")  {
	    alert("Please enter your name.");
	    return false;
	}
		if (document.getElementById('company_org').value == "")  {
	    alert("Please tell us the name of your company or organization. If inquiring as an individual, please enter \"none\" in the company/organization field.");
	    return false;
	}
	if (document.getElementById('area_of_interest').value == "")  {
	    alert("Please tell us about your interests in Lidar data by filling in the \"Area of Interest\" field.");
	    return false;
	}	
  


	    
  if (document.getElementById('email').value == "")  {
	    alert("Please enter an e-mail address where we may contact you.");
	    return false;
	}
with (document.getElementById('email'))
{
apos=value.indexOf("@");
dotpos=value.lastIndexOf(".");
if (apos<1||dotpos-apos<2) 
  {alert('Please enter a valid e-mail address');return false;}

}
      
 
 
  
  


}