function CssClassesHandler(object){this.object=object}
CssClassesHandler.prototype={
	object:null,
	all:function(){return this.object.className.split(/\s+/)},
	exists:function(className){var classes=this.all();for(var i=0;i<classes.length;i++)if(classes[i]==className)return true;return false;},
	add:function(className){var classes=this.all();for(var i=0;i<classes.length;i++)if(classes[i]==className)return;this.object.className=this.object.className+' '+className;},
	remove:function(className){var classes=this.all();var cn='';for(var i=0;i<classes.length;i++)if(classes[i]!=className)cn=cn+' '+classes[i];this.object.className=cn.substr(1);},
	set:function(className, state){if(state)this.add(className);else this.remove(className);},
	flip:function(className){if(this.exists(className))this.remove(className);else this.add(className);}
}
function CssClasses(object){return new CssClassesHandler(object)}

function onlyDigit(e){
	if(!e)e=window.event;
	if(e.charCode==0)return true;
	var cc=e.charCode?e.charCode:e.keyCode;
	if(e.ctrlKey||e.altKey||cc<32)return true;
	return /[\d]/.test(String.fromCharCode(cc));
}