rem: dragImage.style.opacity = null; 
add: dragImage.style.visibility = null; 
context: function breakpointDrag(event){    if (!draggingBreakpoint) {        sourcesDocument.removeEventListener("mousemove", breakpointDrag, true);        sourcesDocument.removeEventListener("mouseup", breakpointDragEnd, true);        return;    }    var x = event.clientX + window.scrollX;    var y = event.clientY + window.scrollY;    var deltaX = draggingBreakpoint.dragLastX - x;    var deltaY = draggingBreakpoint.dragLastY - y;    if (draggingBreakpoint.started || deltaX > 4 || deltaY > 4 || deltaX < -4 || deltaY < -4) {        if (!draggingBreakpoint.started) {            draggingBreakpoint.isDisabled = hasStyleClass(draggingBreakpoint.parentNode, "disabled");            removeStyleClass(draggingBreakpoint.parentNode, "breakpoint");            removeStyleClass(draggingBreakpoint.parentNode, "disabled");            draggingBreakpoint.started = true;            var sourcesDocument = document.getElementById("sources").contentDocument;            var dragImage = sourcesDocument.createElement("img");            if (draggingBreakpoint.isDisabled)                dragImage.src = "breakPointDisabled.tif";            else                dragImage.src = "breakPoint.tif";            dragImage.id = "breakpointDrag";            dragImage.style.top = y - 8 + "px";            dragImage.style.left = x - 12 + "px";            sourcesDocument.body.appendChild(dragImage);        } else {            var sourcesDocument = document.getElementById("sources").contentDocument;            var dragImage = sourcesDocument.getElementById("breakpointDrag");            if (!dragImage) {                sourcesDocument.removeEventListener("mousemove", breakpointDrag, true);                sourcesDocument.removeEventListener("mouseup", breakpointDragEnd, true);                return;            }            dragImage.style.top = y - 8 + "px";            dragImage.style.left = x - 12 + "px";            if (x > 40)                dragImage.style.opacity = "0";            else                dragImage.style.opacity = null;        }        draggingBreakpoint.dragLastX = x;        draggingBreakpoint.dragLastY = y;    }}
meta: 1725	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1725/9293f6919ad79b29515962704500e7d888980dec/debugger.js/clean/WebKitTools/Drosera/debugger.js