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function ltrim(str)

{

	for (i=0; i<str.length; i++)

		if (str.charAt(i)!=" ") break;

	return str.substr(i);

}



function rtrim(str)

{

	for (i=str.length-1; i>-1; i--)

		if (str.charAt(i)!=" ") break;

	return str.substr(0, i+1);

}



function trim(str)

{

	return ltrim(rtrim(str));

}



function checkDate(s) {

	var i1 = s.indexOf("/");

	if (i1<0) return false;

	var i2 = s.indexOf("/",i1+1);

	if (i2<0) return false;

	var dd = s.substr(0, i1);

	var mm = s.substr(i1+1, i2-(i1+1));

	var yy = s.substr(i2+1);



	if (!checkInt(dd)) return false;

	if (!checkInt(mm)) return false;

	if (!checkInt(yy)) return false;



	d = dd.valueOf();

	m = mm.valueOf();

	y = yy.valueOf();



	if ((m<1) || (m>12)) return false;

	if (y<1) return false;

	var leapyear=( (y % 4)==0 );

	var maxday=0;



	maxday=31;

	if ((m==4) || (m==6) || (m==9) || (m==11))

		maxday=30;

	if (m==2)

		maxday=(leapyear)?29:28;



	if ((dd.valueOf()<1) || (dd.valueOf()>maxday)) return false;

	return true;

}



function dateUTC(s) {

	var i1 = s.indexOf("/");

	var i2 = s.indexOf("/",i1+1);

	var dd = s.substr(0, i1);

	var mm = s.substr(i1+1, i2-(i1+1));

	var yy = s.substr(i2+1);

	return Date.UTC(yy, mm-1, dd);

}



function lessDate(s1, s2) {

	return (dateUTC(s1) <= dateUTC(s2));

}

function SoSanhNgay(d1,d2){

	dtest1 = new Date(formatNgay(d1));

	dtest2 = new Date(formatNgay(d2));

		y1=dtest1.getFullYear()

		y2=dtest2.getFullYear()

		m1=dtest1.getMonth()

		m2=dtest2.getMonth()

		d1=dtest1.getDate()

		d2=dtest2.getDate()

		if (y1 < y2)

			return false;

		if (y1 == y2)

		{

		if (m1 < m2)

			return false;

		if (m1 == m2)

			if (d1 < d2)

				return false;

		}

	return true;

}

function checkInt(checkStr) {

	if (checkStr.length < 0) return false;

	var checkOK = "0123456789";

	for (i=0; i<checkStr.length; i++) {

		ch = checkStr.charAt(i);

		if (checkOK.indexOf(ch) < 0)

			return false;

	}

	return true;

}



function checkDouble(checkStr) {

	if (checkStr.length < 1) return false;

	var checkOK = "0123456789.";

	for (i=0; i<checkStr.length; i++) {

		ch = checkStr.charAt(i);

		if (checkOK.indexOf(ch) < 0)

			return false;

	}

	if (checkStr.indexOf(".")!=checkStr.lastIndexOf("."))

		return false;

	return true;

}



function validDouble(st, n)

{

// implement later

// n: so chu so trong phan thap phan

	var i = st.lastIndexOf(".");

	if (i>-1) return ( (st.substr(i+1)).length <= n );

	return true;

}

function CheckPhone(obj){

	var strPhone = obj.value;	

	var checkOK = "0123456789-";

	var allValid = true;

	for (i = 0;  i < strPhone.length;  i++)  {

		ch = strPhone.charAt(i);

	    	for (j = 0;  j < checkOK.length;  j++)

			if ( ch == checkOK.charAt(j) )

				break;

			if (j == checkOK.length)    {

				allValid = false;

		      	break;

		    	}

		  	}

		if (!allValid) {

	    		alert("S? di?n tho?i không dúng qui cách ");

			obj.select();	

			obj.focus();

	    		return (false);

		  }

	return true;

}



function CheckEmail(obj){

	var strEmail=obj.value;

	if ( strEmail != "" ){

		var len = strEmail.length;

		var ch = strEmail.charAt(len-1);

		if (strEmail.indexOf("@")<1){

			alert("Ð?a ch? mail không dúng");

			obj.select();

			obj.focus();		

			return (false);

			}

		if (strEmail.indexOf("@")!=strEmail.lastIndexOf("@")){

			alert("Ð?a ch? mail không dúng");

			obj.select();

			obj.focus();		

			return false;

			} 

		if(ch=="@"){

			alert("Ð?a ch? mail không dúng");

			obj.select();

			obj.focus();		

			return false;

			}

		}

	return true;

}

function popupPage(page) {

	windowprops = "height=500,width=600,location=no,"

	+"scrollbars=yes,menubars=yes,toolbars=yes,resizable=yes";

	window.open(page, "", windowprops);

	}



function popPage(page,target) {

	windowprops = "height=500,width=600,location=no,"

	+"scrollbars=yes,menubars=yes,toolbars=yes,resizable=yes";

	window.open(page, target, windowprops);

	}



function popupPHWS(p,h,w,s) {

	windowprops = "height="+h+",width="+w+",location=no,"

	+"scrollbars=yes,menubars=yes,toolbars=yes,resizable="+s;

	window.open(p, "", windowprops);

	}



function popupPageHelp(page) {

	windowprops = "height=415,width=610,location=no,"

	+"scrollbars=yes,menubars=yes,toolbars=yes,resizable=none";

	window.open(page, "HELP", windowprops);

	}



//-->