function changeUrl(url, pname, pvalue, todel) {
if(url==""){url = window.location.href;}
if(todel==undefined) {var todel = new Array();}
for(i=0;i<todel.length;i++){
	if (url.indexOf(todel[i]+"=") != -1) {
	  var before = url.substring(0, url.indexOf(todel[i]+"=")-1);
	  var after = url.substring(url.indexOf(todel[i]+"="));
	  if (after.indexOf('&') != -1)
	   after = after.substring(after.indexOf("&"), after.length);
	  else
	   after = "";	
	url = before + after;
	}
}
	
 if (url.indexOf(pname+"=") != -1) {
  var before = url.substring(0, url.indexOf(pname+"="));
  var after = url.substring(url.indexOf(pname+"="));
  if (after.indexOf('&') != -1)
   after = after.substring(after.indexOf("&"), after.length);
  else
   after = "";
   gohere = before + pname + "=" + pvalue + after;
   	if(gohere.indexOf("?")==-1){
		pos=gohere.indexOf("&");		
		if(pos!=-1) gohere = gohere.substr(0,pos)+"?"+gohere.substr(pos+1,gohere.length);
	}
  return gohere;
 } else{
    gohere = url+(url.indexOf("?")=="-1"?"?":"&")+pname+"="+pvalue
  return gohere;
 }
} 



function getURLParamValueFrom(name, url) {
 // case sensitive!
 if (url.indexOf(name+"=") != -1) {
  var currparams;
  var paramarr = url.split('?');
  var paramstr = paramarr[1];
  var params = paramstr.split('&');
  for (var a = 0; a < params.length; a++) {
   currparams = params[a].split('=');
   if (currparams[0] == name) {
    if (currparams.length == 1)
     return true;
    else
     return currparams[1];
   }
  }
 }
 return false;
}

function checkMail(x)
{
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x)) {
		return true;
	} else {
		return false;
	}
}

var isNumeric = function(x) {
   // returns true if x is numeric and false if it is not.
   var RegExp = /^(-)?(\d*)(\.?)(\d*)$/; 
   return String(x).match(RegExp);
}

var isLetter = function(x) {
	if(!String(x).match(/^[ a-zа-яА-ЯЙйЁёĀāČčĢģĒēĶķĪīŅņĻļŠšŪū_-]+$/)) {
		return false;
	} else return true;
}

function validLettersNumbers(strng) {
	var alphaExp = /^[0-9a-zA-Z_-]+$/;
	if (strng.match(alphaExp)==null || strng=="") {
		return false;
	} else return true;
}

function returnValidString(strng) {
	if (strng!="") {
		return strng.match(/[0-9a-zа-яА-ЯЙйЁёĀāČčĢģĒēĶķĪīŅņĻļŠšŪū_-]/gi).join('');
	} else return true;
}

function refresh_close(){
	var refresh;
	if(window.opener.location.href.indexOf('#')!=-1){
		refresh = window.opener.location.href.substring(0, window.opener.location.href.indexOf('#'));
	}else refresh = window.opener.location;
	window.opener.location=refresh;
	window.close();
}




Array.prototype.in_array = function(p_val) {
	for(var i = 0, l = this.length; i < l; i++) {
		if(this[i] == p_val) {
			return true;
		}
	}
	return false;
}