function echeck(str){var at="@"
var dot="."
var lat=str.indexOf(at)
var lstr=str.length
var ldot=str.indexOf(dot)
if(str.indexOf(at)==-1){alert("Please enter a valid email.")
return false}
if(str.indexOf(at)==-1||str.indexOf(at)==0||str.indexOf(at)==lstr){alert("Please enter a valid email.")
return false}
if(str.indexOf(dot)==-1||str.indexOf(dot)==0||str.indexOf(dot)==lstr){alert("Please enter a valid email.")
return false}
if(str.indexOf(at,(lat+1))!=-1){alert("Please enter a valid email.")
return false}
if(str.substring(lat-1,lat)==dot||str.substring(lat+1,lat+2)==dot){alert("Please enter a valid email.")
return false}
if(str.indexOf(dot,(lat+2))==-1){alert("Please enter a valid email.")
return false}
if(str.indexOf(" ")!=-1){alert("Please enter a valid email.")
return false}
return true}
function check_form(){if(document.contact.name.value==""){alert("Please enter your name.");document.contact.name.focus();return false;}
if(document.contact.email.value==""){alert("Please enter your email.");document.contact.email.focus();return false;}
var email=document.contact.email;if(echeck(email.value)==false){email.value=""
email.focus()
return false}
if(document.contact.message.value==""){alert("Please enter your message.");document.contact.message.focus();return false;}
if(document.contact.security_code.value==""){alert("Please enter the security code.");document.contact.security_code.focus();return false;}}