The trial of a Windham man charged withsexually assaulting a 4-year-old girl has started. Nicholas Gladu’s trial on 68 charges including unlawful sexualcontact and sexual exploitation of a minor started Monday inCumberland County Superior Court in Portland. The prosecutors said in opening statements that the 27-year-oldGladu sexually assaulted the girl between August and October of2010 and that photographic evidence found on a digital camera cardwill be shown to the jury. Gladu’s lawyer said the defendant has a history of mental illness and mental problems that affected his ability to determine right from wrong. Gladu has pleaded not guilty by reason of insanity.