function rowopen1()
 {
 document.getElementById('row1').style.display="block"
 document.getElementById('row2').style.display="none"
 document.getElementById('row3').style.display="none"
 document.getElementById('row4').style.display="none"
 
 }

function rowopen2()
 {
 document.getElementById('row1').style.display="none"
 document.getElementById('row2').style.display="block"
document.getElementById('row3').style.display="none"
 document.getElementById('row4').style.display="none"

 }

function rowopen3()
 {
document.getElementById('row1').style.display="none"
 document.getElementById('row2').style.display="none"
 document.getElementById('row3').style.display="block"
 document.getElementById('row4').style.display="none"
 
 }

function rowopen4()
 {
 document.getElementById('row1').style.display="none"
 document.getElementById('row2').style.display="none"
 document.getElementById('row3').style.display="none"
 document.getElementById('row4').style.display="block"	
 
 }