function click_btn(id_over){
var btn=document.getElementById(id_over);
		if(id_over=="loginbtn"){
			btn.src="images/home2/login_over.png";
		}
		else if(id_over=="btn_search"){
			btn.src="images/home2/btn_search_r.png"
		}
		else{
		btn.src="images/home2/"+id_over+"_over.png"
		}
}
function normal_btn(id_out){
var btn=document.getElementById(id_out);
	btn.src="images/home2/"+id_out+".png";
}
//---------------------------------------------------------------------------

var newWindow;
function openPopup(popup_width,popup_height,popup_url,popup_name){
	var windowHeight = popup_height;
	var windowWidth = popup_width;
	var windowName = popup_name;
	var windowUri = popup_url;

	var centerWidth = (window.screen.width - windowWidth) / 2;
	var centerHeight = (window.screen.height - windowHeight) / 2;

	if ( !newWindow || newWindow.closed ){
		newWindow = window.open(windowUri, windowName,'addressbar=0,menubar=0,location=0,status=0,scrollbars=0,resizable=0,width=' + windowWidth + 
        	',height=' + windowHeight + 
        	',left=' + centerWidth + 
        	',top=' + centerHeight);
    	try{
			newWindow.location.href; // throws exception if after reload
			newWindow.location = windowUri;
		}catch(e){};
	}
	 if ( newWindow && ! newWindow.closed ){
		newWindow.focus();
	 }

}
//---------------------------------------------------------------------------
function showpp(){
	openPopup(580,500,'invite_friends.php','xx');	
}