// JavaScript Document
function isEmail(email) {
	var Temp = email
	var str = Temp
	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 email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
			alert('Please enter a valid email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
			alert('Please enter a valid email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	}

	 if (str.indexOf(at,(lat+1))!=-1){
			alert('Please enter a valid email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
			alert('Please enter a valid email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
			alert('Please enter a valid email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	 }
	
	 if (str.indexOf(" ")!=-1){
			alert('Please enter a valid email address.');
			//Temp.focus();
			//Temp.select();
			return false;
	 }
	 return true; 
}

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) 
          return false;
    }
    // All characters are numbers.
    return true;
}