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 ValidateEmail(strId)
{
    //expects that strId is the id name of the email input element
    
    var oEmail = document.getElementById(strId);
    
    if(oEmail)
    {
        if ((oEmail.value==null)||(oEmail.value=="")){
	        alert("Please Enter your Email Address")
	        oEmail.focus()
	        return false
        }
        if (echeck(oEmail.value)==false){
	        oEmail.select();
	        oEmail.focus();
	        return false
        }
    }
    
    return true
}