// trim string
function trim(str)
{
    if(!str || typeof str != 'string')
        return null;

    return str.replace(/^[\s]+/,'').replace(/[\s]+$/,'').replace(/[\s]{2,}/,' ');
}

// check valid/invalid email address
function email_check(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 false
	}

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

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

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

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

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

	 if (str.indexOf(" ")!=-1){
		return false
	 }

	 return true
}

// create pop-up window
function popUp(URL, width, height, left, top) {
	day = new Date();
	id = day.getTime();
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=1,width=" + width + ",height=" + height + ",left=" + left + ",top=" + top + "');");
}

//redirect to given url
function redirect(URL)
{
	window.location=URL;
}

// count text inside textbox/textarea & display it in real time
function textCounter(field, countfield, maxlimit)
{
	if (field.value.length > maxlimit)
		field.value = field.value.substring(0, maxlimit);
	else
		countfield.value = maxlimit - field.value.length;
}

// check valid/invalid username address
function validateUsername(fld) {
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores

    if (fld.value == "") {
        error = "&bull; Please enter Username<br>";
    } else if ((fld.value.length < 5) || (fld.value.length > 15)) {
        error = "&bull; Username must have 5-15 characters<br>";
    } else if (illegalChars.test(fld.value)) {
		error = "&bull; Please enter valid Username. Use only numbers and alphabets<br>";
    } else {
        error = "";
    }
    return error;
}


//===================== commonly used javascript on admin pages ========================
//CHECK ALL RECORDS
function check_list()
{
    var theForm = document.frmList;
	if(theForm.check_all.checked==true)
		a=1;
	else
		a=0;

    for (i=1; i<theForm.elements.length; i++)
	{
        if (theForm.elements[i].name=='mycheckbox[]')
            theForm.elements[i].checked = a;
    }
}


//CHECKS THAT ANY RECORD IS CHECKED OR NOT
function any_checked()
{
	var theForm = document.frmList;
	var check_flag=0;

	for (i=0; i<theForm.elements.length; i++)
	{
   		if(theForm.elements[i].checked==true)
            check_flag=1;
    }

	if(check_flag==1)
		return true;
	else
		return false;
}
//========================================================================================

function IsNumeric(s)
{
	return (s.toString().search(/^-?[0-9]+$/) == 0);

	/*var ValidChars = "0123456789";
	var IsNumber=true;
	var Char;

	for (i = 0; i < sText.length && IsNumber == true; i++)
	{
		Char = sText.charAt(i);
		if (ValidChars.indexOf(Char) == -1)
		{
			IsNumber = false;
		}
	}
	return IsNumber;*/
}

function IsDecimal(sText)
{
	var ValidChars = "0123456789.";
	var IsDecimal=true;
	var Char;

	for (i = 0; i < sText.length && IsDecimal == true; i++)
	{
		Char = sText.charAt(i);
		if (ValidChars.indexOf(Char) == -1)
		{
			IsDecimal = false;
		}
	}
	return IsDecimal;
}

function check_search_form()
{
	if(document.frmSearch.keyword.value=="" || document.frmSearch.keyword.value==null)
	{
		alert("Please enter Keyword to search.");
		return false;
	}
	else
	{
		return true;
	}
}