function Size(){this.type= SIZE_TYPE
this.width= this.firstWidth= arguments[0];this.height= this.firstHeight= arguments[1];this.set= setSize;this.add= sizeAdd
this.getCopy= new Function("return new Size(this.width, this.height);");return this}
function setSize(width,height){this.width= width;this.height= height}
function sizeAdd(size){this.width= parseInt(this.width,10) + parseInt(size.width,10)
this.height= parseInt(this.height,10) + parseInt(size.height,10)}