var $_GET=new function(){
	var fullUrl=window.location.href.split('?');
	var urlParams=fullUrl[1].split('&');
	
	$_GET=new Array();
	
	for(i=0;i<=urlParams.length-1;++i){
		var param=urlParams[i].split('=');
		var name=param[0];
		var value=param[1];
		$_GET[name]=value;
	}
	return $_GET;
}

Simulate the $_GET array from php in javascript to get url parameters this way:
url= http://localhost/?var1=example
$_GET['var1'] will return "example"

Just copy and paste the code.

Function to simulate PHP $_GET in javascript

javascript, php, function

JavaScript