<!--

function check_form(f) { // f is the form (passed using the this keyword)
// check the first email address ( the exclamation means "not" )
if(!check_email(f.c_email.value)){
alert("Invalid email detected.");
f.c_email.focus(); 
// if the browser is Netscape 6 or IE
if(document.all || document.getElementByID){
// change the color of text field
f.c_email.style.background = "yellow";
}
// make sure the form is not submitted
return false;

}

}

// -->