var vTable = new Array('table1','table2','table3','table4','table5');
              window.onload = function(){
                  var a, b;
                  for (var j=0;j<vTable.length;j++){
                      a = document.getElementById(vTable[j]);
                      b = a.getElementsByTagName('tr');
                      for(var i=1;i<b.length;i++) {
                          b[i].onmouseover = fSetActiveColor;
                          b[i].onmouseout = fSetDefaultColor;
                      }
                  }   
              }
              function fSetActiveColor(){
                  this.style.backgroundColor = '#EEEEEE';
              }
              function fSetDefaultColor(){
                  this.style.backgroundColor = '';
              }