function rollover1(newImage) {
    document.newhouses.src = newImage;
  }
  
function rollover2(newImage) {
    document.apartmentdevelopments.src = newImage;
  }
  
function rollover3(newImage) {
    document.remodelledresidences.src = newImage;
  }
  
function rollover4(newImage) {
    document.commercialdevelopments.src = newImage;
  }