/**
 * DHTML email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

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 e-mail address")
           return false
        }

        if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
           alert("Please enter a valid e-mail address")
           return false
        }

        if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
            alert("Please enter a valid e-mail address")
            return false
        }

         if (str.indexOf(at,(lat+1))!=-1){
            alert("Please enter a valid e-mail address")
            return false
         }

         if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
            alert("Please enter a valid e-mail address")
            return false
         }

         if (str.indexOf(dot,(lat+2))==-1){
            alert("Please enter a valid e-mail address")
            return false
         }

         if (str.indexOf(" ")!=-1){
            alert("Please enter a valid e-mail address")
            return false
         }

         return true
    }

function ValidateEmail(){
    var emailID=document.email.to_email_address;

    if ((emailID.value==null)||(emailID.value=="")){
        alert("Enter your e-mail address")
        emailID.focus()
        return false
    }
    if (echeck(emailID.value)==false){
        emailID.value=""
        emailID.focus()
        return false
    }
    return true
 }