var origTekst    = "ffffff"; 	      // beginkleur tekst (zonder #)
var nieuwTekst = "000000";   // eindkleur tekst (zonder #)
var origCel        = "0000ff"; 	// beginkleur cel (zonder #)
var nieuwCel     = "ffff00";  	// eindkleur cel (zonder #)

function cellover1(tc) { 
  tc.style.backgroundColor = "#" + nieuwCel; 
  tc.style.color = "#" + nieuwTekst; 
} 

function cellout1(tc) { 
  tc.style.backgroundColor = "#" + origCel; 
  tc.style.color = "#" + origTekst;   
} 

<!-- Begin menu openen vensters
function openWindowSupergroot(url) {
  popupWin = window.open(url,'','dependent,width=700,height=500,left=25,top=25,scrollbars=yes')
}
function openWindowGroot(url) {
  popupWin = window.open(url,'','dependent,width=600,height=500,left=25,top=25,scrollbars=yes')
}
function openWindowMiddel(url) {
  popupWin = window.open(url,'','dependent,width=500,height=400,left=25,top=25,scrollbars=yes')
}
function openWindowKlein(url) {
  popupWin = window.open(url,'','dependent,width=400,height=300,left=25,top=25,scrollbars=yes')
}
function openWindowSuperklein(url) {
  popupWin = window.open(url,'','dependent,width=300,height=200,left=25,top=25,scrollbars=yes')
}
// Einde menu vensters-->