function iwRectangle(x1,y1,x2,y2){this.x1=x1;this.y1=y1;this.x2=x2;this.y2=y2;this.IsOverlappedBy=iwIsOverlappedBy;}
function iwIsOverlappedBy(oRectangle){var nOffset=500;if(oRectangle.x2 + nOffset<this.x1)return false;if(oRectangle.y2 + nOffset<this.y1)return false;if(oRectangle.x1 - nOffset>this.x2)return false;if(oRectangle.y1 - nOffset>this.y2)return false;return true;}