Element.implement({
getElementsByClassName: function(className){
return this.getElements('.'+className);
}
});


Element.extend({
effect: function(property, options){
return new fx.Style(this, property, options);
},

effects: function(property, options){
return new fx.Styles(this, property, options);
}
});

fx.Styles.implement({    
    move: function(topTo, leftTo){
        this.custom({'top': [this.el.getStyle('top', true), topTo], 'left': [this.el.getStyle('left', true), leftTo]});
    } 
      
});


Tips.implement({
locate: function(evt){
var doc = document.documentElement;
var yPos;
var yDiff= this.toolTip.offsetHeight + 20;

tmp= function(){
alert(this.toolTip.offsetHeight);
}.bind(this);

if(evt.clientY < (doc.clientHeight * .5)){
yPos= evt.clientY + doc.scrollTop + 30;
}else{
yPos= evt.clientY + doc.scrollTop - yDiff;
}

this.toolTip.setStyles ? this.toolTip.setStyles({'top': yPos + 'px', 'left': evt.clientX + doc.scrollLeft - 30 + 'px'}):null;
}
});

Element.extend({

cumulativeOffset: function() {
element= this;
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop  || 0;
valueL += element.offsetLeft || 0;
element = element.offsetParent;
} while (element);
return [valueL, valueT];
}

});

fx.Scroll = Fx.Base.extend({

initialize: function(options) {
this.setOptions(options);
},

scrollTo: function(el){
var desty = $(el).cumulativeOffset();
var dest = desty[1];
var client = window.innerHeight || document.documentElement.clientHeight;
var full = document.documentElement.scrollHeight;
var top = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
if (dest+client > full) this.custom(top, dest - client + (full-dest));
else this.custom(top, dest);
},

increase: function(){
window.scrollTo(0, this.now);
}
});


String.extend({

isEmpty:function(){
return (this.length > 0 ? 'false':'true');
},

isString:function(){
return (this.test('[0-9]','ig') ? 'false':'true');
},

isSingleWord:function(){
return (this.test(' ','ig') ? 'false':'true');
},

isEmail:function(){
return (this.test('^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$','ig') ? 'true':'false');
}
});