function stringFilter (input) {

    var curtextval = document.getElementById("message");
    curtextval.innerHTML = "";
    
    if (document.editForm.seria.selectedIndex <= 0)
    {
        var curtextval = document.getElementById("message");
        curtextval.innerHTML = "Please select the series!";
        
        return false;
    }

	s = input.value;
	filteredValues = "1234567890,-";
	var i;
	var returnString = "";
	for (i = 0; i < s.length; i++) {
		var c = s.charAt(i);
		if (filteredValues.indexOf(c) != -1) returnString += c;
	}
	input.value = returnString;

	if(input.value=="") {    
        var curtextval = document.getElementById("message");
        curtextval.innerHTML = "Enter some valid numbers!";
        
        return false;
    }
    
    return true;
}

function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}

window.onload = externalLinks;