function get_param(name){
  var regexS = "[\\?&]"+name+"=([^&#]*)";
  var regex = new RegExp( regexS );
  var tmpURL = window.location.href;
  var results = regex.exec( tmpURL );
  if( results == null )
    return "";
  else
    return results[1];
}

String.prototype.isEmail = function () {

	var re = /^[\w_.-]+@[\w.-]+(\.\w+)+$/;

	return re.test(this);

};



String.prototype.isInteger = function () {

	return (isNaN(parseInt(this))) ? false : true;

};



String.prototype.isDate = function () {

	var err = 0

	a = this;

	if (a.length != 10) err=1

	b = parseInt(a.substring(0, 4),10)// year

	c = a.substring(4, 5)// '-'

	d = parseInt(a.substring(5, 7),10)// month

	e = a.substring(7, 8)// '-'

	f = parseInt(a.substring(8, 10),10)// day

	//basic error checking

	if (b<0 || b>3000 || isNaN(b)) err = 1

	if (c != '-') err = 1

	if (d<1 || d>12 || isNaN(d)) err = 1

	if (e != '-') err = 1

	if (f<1 || f>31 || isNaN(f)) err = 1

	//advanced error checking

	// months with 30 days

	if (d==4 || d==6 || d==9 || d==11){

		if (f==31) err=1

	}

	// february, leap year

	if (d==2){ // feb

		var g=parseInt(b/4)

		if (isNaN(g)) {

			err=1

		}

		if (f>29) err=1

		if (f==29 && ((b/4)!=parseInt(b/4))) err=1

	}

	if (err==1){

		return false;

	}else{

		return true;

	}

}



String.prototype.isAlphaNumeric = function () {

	var RE1 = new RegExp("[^0-9a-zA-Z_]");

	return (RE1.test(this)) ? false : true;

};



String.prototype.isPassword = function () {

	if (this.length < 5 || this.length > 8) {

		return false;

	} else {

		var RE1 = new RegExp("[^0-9a-zA-Z_]");

		return (RE1.test(this)) ? false : true;

	}

};



String.prototype.isDoc = function () {

	if (this.lastIndexOf(".doc") > 0) return true;

	if (this.lastIndexOf(".DOC") > 0) return true;

	if (this.lastIndexOf(".pdf") > 0) return true;

	if (this.lastIndexOf(".PDF") > 0) return true;

	if (this.lastIndexOf(".ppt") > 0) return true;

	if (this.lastIndexOf(".PPT") > 0) return true;

	return false;

};



String.prototype.isImg = function () {

	if (this.lastIndexOf(".gif") > 0) return true;

	if (this.lastIndexOf(".jpg") > 0) return true;

	if (this.lastIndexOf(".GIF") > 0) return true;

	if (this.lastIndexOf(".JPG") > 0) return true;

	if (this.lastIndexOf(".PNG") > 0) return true;

	if (this.lastIndexOf(".png") > 0) return true;

	return false;

};



String.prototype.isVideo = function () {

	if (this.lastIndexOf(".flv") > 0) return true;

	if (this.lastIndexOf(".wmv") > 0) return true;

	if (this.lastIndexOf(".FLV") > 0) return true;

	if (this.lastIndexOf(".WMV") > 0) return true;

	return false;

};



String.prototype.isFlickr = function () {

	if (this.lastIndexOf(".flickr.com") > 0) return true;

	return false;

};



String.prototype.isYoutube = function () {

	if (this.lastIndexOf(".youtube.com") > 0) return true;

	return false;

};



var newWin;

function newWindow(url) {

	win_name = "popup";

	width = 700;

	height = 400;

	winLeft = (screen.width-width)/2; 

	winTop = (screen.height-(height+110))/2; 

	win_size = "resizable,scrollbars,status,top="+winTop+",left="+winLeft+",width="+width+",height="+height;

	if (navigator.appName=="Microsoft Internet Explorer" && navigator.appVersion >="4")

	if (newWin!=null)

		newWin.close();

	newWin = window.open (url, win_name, win_size);

	if (navigator.appName=="Netscape" && navigator.appVersion >= "3")

		newWin.focus();

}



function checkfield(obj, txt) {

	if ($(obj).getValue().strip().empty()) {

		alert(txt);

		$(obj).value = $(obj).getValue().strip();

		$(obj).focus();

		return false;

	} else {

		$(obj).value = $(obj).getValue().strip();

		return true;

	}

}



function countChecked(obj, element_name) {

	len=obj.elements.length;

	var i=0;

	var j=0;

	for( i=0 ; i<len ; i++) {

		if (obj.elements[i].name==element_name && obj.elements[i].checked)

		j=j+1;

	}

	return j;

}



function countSelected(selObj) {

	var i;

	var count = 0;

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

		if (selObj.options[i].selected) {

			count++;

		}

	}

	return count;

}