var ttWidth    = 125;
var ttOffsetX      = -10;            // horizontal offset of left-top corner from mousepointer
var ttOffsetY      = -60;           // vertical offset                   "
var text1      = "Photo by Shelley Powers. Used by permission.";
var text2      = "Photo by Dr. Eric Crystal. Used by permission.";
var text3      = "Photo courtesy Charles Shaw.";
var text4      = "Photo courtesy Marco van Ouden.";