function blink1(){
if(blinkblock1.style.visibility=="visible")
   blinkblock1.style.visibility="hidden";
else blinkblock1.style.visibility="visible";
}
function blink2(){
if(blinkblock2.style.visibility=="visible")
   blinkblock2.style.visibility="hidden";
else blinkblock2.style.visibility="visible";
}
function blink3(){
if(blinkblock3.style.visibility=="visible")
   blinkblock3.style.visibility="hidden";
else blinkblock3.style.visibility="visible";
}
function blink4(){
if(blinkblock4.style.visibility=="visible")
   blinkblock4.style.visibility="hidden";
else blinkblock4.style.visibility="visible";
}
function blink5(){
if(blinkblock5.style.visibility=="visible")
   blinkblock5.style.visibility="hidden";
else blinkblock5.style.visibility="visible";
}