function changeSrc1()
  {
  document.getElementById("logotip").src="images/partneri_img/alukonig.png ";
  }
 function changeSrc2()
  {
  document.getElementById("logotip").src="images/partneri_img/prazna.png";
  } 
  function changeSrc3()
  {
  document.getElementById("logotip").src="images/partneri_img/feal.png ";
  }
  
 function changeSrc4()
  {
  document.getElementById("logotip").src="images/partneri_img/gealan.png ";
  }
 function changeSrc5()
  {
  document.getElementById("logotip").src="images/partneri_img/gu.png ";
  }
 function changeSrc6()
  {
  document.getElementById("logotip").src="images/partneri_img/hormann.png ";
  }
 function changeSrc7()
  {
  document.getElementById("logotip").src="images/partneri_img/promglas.png ";
  }
 function changeSrc8()
  {
  document.getElementById("logotip").src="images/partneri_img/roto.png ";
  }
 function changeSrc9()
  {
  document.getElementById("logotip").src="images/partneri_img/schuco.png ";
  }