function check_form() {

	if(!check_email(document.getElementById('femail').value)){

		document.getElementById('femail').focus(); 
		// if the browser is Netscape 6 or IE
		if(document.all || document.getElementByID){
			// change the color of text field
			// document.getElementById('femail').style.background = "yellow";
		}
		// make sure the form is not submitted
		return false;
	} else {
	return true;
      }
}

function check_email(e) {
	ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";
	atok=0;
	if(e.length>75){
		return false;
	}	

	for(i=0; i < e.length ;i++){
		if(ok.indexOf(e.charAt(i))<0){ 
			alert("Invalid email.");
			return false;
		}	
		if(e.charAt(i)=="@"){
               atok=1;
		} 
	} 
	if(atok==1){
		return true;
	} else {
		alert("Invalid email.");
		return false;
	}	
}