// Check for namespace collision
if ("undefined" == typeof(ImageHelper))
{
	ImageHelper = new Object();
	ImageHelper.imgRe = /^.+\.(jpg|jpeg|gif|png)$/i;
}

// preview image
ImageHelper.Preview =function (pathField, previewName)
{          
    var path = pathField.value; 
    if (path.search(ImageHelper.imgRe) != -1)
    {
       //alert(previewName);  
       var img = document.getElementById(previewName);
       //alert(img); 
       img.height = 130;
       img.width = 140;
       img.src = 'file://'+path;
   
    }       
    else    
    {   
        alert("JPG, PNG, and GIFs only!");
    }   
}

// Validate specify the image file path
ImageHelper.Validate = function (id)
{
  return document.getElementById(id).value != "";
}