valid_alphanumeric = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ '.,-";
valid_alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ '.,";
valid_email = "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ@_-.";
valid_numeric = "1234567890";
valid_num = "1234567890 +-";

function check(obg,charset) {
 var str = obg.value;
 var new_value="";
 for (var i=0; i < str.length; i++) { 
 	var letter = str.charAt(i).toUpperCase();
	new_value +=letter; 
 }
 obg.value = new_value;
 str = new_value; 
 var inv = "";
 var vld = "";
 var prev = "";
 for (var i=0; i < obg.value.length; i++) {
	var letter = str.charAt(i);
	if (charset.indexOf(letter) != -1) {
		if(prev==" " && letter==" ") { }
		else vld += letter;
		prev = letter;
		continue; 
	}
	else {
		if(letter==" ") letter = "space";
		inv += "["+letter+"] ";
	}
 }
 if(vld==" ") vld="";
 obg.value = vld;
 if(inv!="") {
 	alert_str = "Invalid characters: "+inv;
	alert_str += "\n------------------------------------------\n";
//	alert_str += "Accepting only numeric Characters\n";
//	alert_str += "for this field : \n";
//	alert_str += "["+charset;
//	if(charset == valid_alpha) alert_str +=" and space";
//	alert_str += "]";
//	alert_str += "-------------------------------------------\n";
	alert_str += "Removing invalid characters";
	alert(alert_str); 
	return false;
 }
}