Question : Javascript email validation error

Hello,

I am using the code below and even thought it errors it still submits the form.

Please let me know how to fix this, thank you!

Matt 
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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("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail Address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail Address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

 		 return true					
	}
	
	
function checkform(form)
{
  if (form.name.value == "") {
    alert( "Please complete all of the required* fields." );
    return false;
  }
  
if (echeck(form.email.value)==false){
		email.value=""
		email.focus()
		return false
	}
 onSubmitButton();
  return true;
}

Answer : Javascript email validation error

Your email vars are undefined.  Change to
if (echeck(form.email.value)===false){
            form.email.value="";
            form.email.focus();
            return false;
      }
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