function isEmpty(argvalue)
{
	if(trim(argvalue)=="")
	{
		return true;
	}
	return false;
}

function hasInvalidChar(argvalue)
{
	var invalids = new Array()
	invalids[0] = "!"
	invalids[1] = "\""
	invalids[2] = "#"
	invalids[3] = "$"
	invalids[4] = "%"
	invalids[5] = "&"
	invalids[6] = "'"
	invalids[7] = "("
	invalids[8] = ")"
	invalids[9] = "*"
	invalids[10] = "+"
	invalids[11] = ","
	invalids[12] = "-"
	invalids[13] = "."
	invalids[14] = "/"
	invalids[15] = ":"
	invalids[16] = ";"
	invalids[17] = "<"
	invalids[18] = "="
	invalids[19] = ">"
	invalids[20] = "?"
	invalids[21] = "@"
	invalids[22] = "["
	invalids[23] = "\\"
	invalids[24] = "]"
	invalids[25] = "^"
	invalids[26] = "_"
	invalids[27] = "`"
	invalids[28] = "{"
	invalids[29] = "|"
	invalids[30] = "}"
	invalids[31] = "~"
	
	for(var i=0;i<invalids.length;i++)
	{
		if(argvalue.indexOf(invalids[i])>=0)
		{
			return true;
		}
	}
	return false;
}

function hasSpace(argvalue)
{
	if(trim(argvalue).indexOf(" ")>=0)
	{
		return true;
	}
	return false;
}

function emptyAlert(argvalue)
{
	alert("Please enter " + argvalue);
}

function invalidCharAlert(argvalue)
{
	alert(argvalue + " contains invalid character.\n!\"#$%&'()*+,-./:;<=>?@[\]^_`{|}~");
}

function hasSpaceAlert(argvalue)
{
	alert(argvalue + " cannot contain spaces.");
}

function emailAlert()
{
	alert("Invalid email.");
}

function ltrim(argvalue)
{
	while(true)
	{
    	if (argvalue.substring(0, 1) != " ")
			break;
		argvalue = argvalue.substring(1, argvalue.length);
	}
	return argvalue;
}

function rtrim(argvalue)
{
	while (true)
	{
    	if (argvalue.substring(argvalue.length - 1, argvalue.length) != " ")
			break;
		argvalue = argvalue.substring(0, argvalue.length - 1);
	}
	return argvalue;
}

function trim(argvalue)
{
	var tmpstr = ltrim(argvalue);
	return rtrim(tmpstr);
}

function invalidEmail(str)
{

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   return true
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return true
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return true
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    return true
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return true
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    return true
		 }
		
		 if (str.indexOf(" ")!=-1){
		    return true
		 }

 		 return false					
}

function ismaxlength(obj){
var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : ""
if (obj.getAttribute && obj.value.length>mlength)
obj.value=obj.value.substring(0,mlength)
}