/*
// 2006-09-06
// Copyright (c) Art. Lebedev | http://www.artlebedev.ru/
// Author - Vladimir Tokmakov
*/

function cmnInformation(){
	var eHTML = document.getElementsByTagName( 'html' )[0];
	this.sUser_agent = navigator.userAgent.toLowerCase();
	if( window.opera ){
		this.bOpera = true; cmnSet_class( eHTML, 'Opera');
	}
	if( !this.bOpera && this.sUser_agent.indexOf( 'msie' ) != -1 ){
		this.bIE = true; cmnSet_class( eHTML, 'IE');
	}else if( navigator.product == 'Gecko' ){
		this.bGecko = true; this.bMozilla = true; cmnSet_class( eHTML, 'Mozilla');
	}
	this.bMAC = ( this.sUser_agent.indexOf( 'mac' ) != -1 );
	this.sLanguage = null;
	this.bHTTP = null;
	this.bHandheld = false;
	return this;
}

function cmnPlaceholder( eThis, sText, sClass_on_empty ){
	eThis.onfocus = function(){ if( eThis.value.length && eThis.value == sText ){ eThis.value = ''; } cmnRemove_class( this, sClass_on_empty ); eThis.select(); }
	eThis.onblur = function(){ if( !this.value.length ){ cmnSet_class( this, sClass_on_empty ); this.value = sText; } }
	if( !eThis.value.length ){ eThis.onblur(); }
	if( !eThis.getAttribute( 'placeholder' ) ){ eThis.setAttribute( 'placeholder', sText ); }
}



function cmnSwitch_class( eOn, sClass_name, sInstead ){
	if( cmnMatch_class( eOn, sClass_name ) ){
		cmnSet_class( eOn, sInstead, sClass_name );
	}else{
		cmnSet_class( eOn, sClass_name, sInstead );
	}
}

function cmnRemove_class( eOn, sClass_name ){
	cmnSet_class( eOn, "", sClass_name );
}

function cmnSet_class( eOn, sClass_name, sInstead ){
	if( eOn ){
		sClass_name = ( sClass_name.length ) ? sClass_name.replace( /(^\s+|\s+$)/, "" ) : "";
		if( eOn.className.length ){
			var sOld = sClass_name;
			if( sInstead && sInstead.length ){
				sInstead = sInstead.replace( /\s+(\S)/g, "|$1" );
				if( sOld ){
					sOld += "|";
				}
				sOld += sInstead;
			}
			eOn.className = eOn.className.replace( new RegExp("(^|\\s+)(" + sOld +")($|\\s+)", "g"), "$1" );
		}
		eOn.className += ( eOn.className.length && sClass_name ? " " : "" ) + sClass_name;
	}
}

function cmnMatch_class( eOn, sClass_name ){
	return ( sClass_name && eOn.className && eOn.className.length && eOn.className.match( new RegExp("(^|\\s+)(" + sClass_name +")($|\\s+)") ) );
}




function cmnAdd_button_events( eOn ){
	cmnAdd_hover( eOn );
	cmnAdd_event( eOn, "mousedown", function(){ cmnSet_class( eOn, "mousedown" ) } );
	cmnAdd_event( eOn, "mouseup", function(){ cmnSwitch_class( eOn, "mousedown", "mouseup" ) } );
}

function cmnAdd_hover( eOn ){
	cmnAdd_event( eOn, "mouseover", function(){ cmnSet_class( eOn,    "hover" ) } );
	cmnAdd_event( eOn, "mouseout",  function(){ cmnRemove_class( eOn, "hover" ) } );
}

function cmnAdd_events( eOn, asEvent_type, ptrFunction ){
	for( var sName in asEvent_type ){
		cmnAdd_event( eOn, asEvent_type[sName], ptrFunction );
	}
}

function cmnAdd_event( eOn, sEvent_type, ptrFunction ){
	if( eOn.addEventListener ){
		eOn.addEventListener( sEvent_type, ptrFunction, false );
	}else{
		if( !ptrFunction.$$guid ){ ptrFunction.$$guid = cmnAdd_event.guid++; }
		if( !eOn.events ){ eOn.events = {}; }
		var aHandler = eOn.events[sEvent_type];
		if( !aHandler ){
			aHandler = eOn.events[sEvent_type] = {};
			if( eOn['on' + sEvent_type] ){ aHandler[0] = eOn['on' + sEvent_type]; }
			eOn['on' + sEvent_type] = cmnHandle_event;
		}
		aHandler[ptrFunction.$$guid] = ptrFunction;
	}
}
cmnAdd_event.guid = 1;

function cmnRemove_event( eOn, sEvent_type, ptrFunction ){
	if( eOn.removeEventListener ){
		eOn.removeEventListener( sEvent_type, ptrFunction, false );
	}else if( eOn.events && eOn.events[sEvent_type] && ptrFunction.$$guid ){
		delete eOn.events[sEvent_type][ptrFunction.$$guid];
	}
}