function check(field, status, restrict) {

for (i = 0; i < field.length; i++) {
    if ((field[i].id == restrict) && (field[i].type=='checkbox') && (!field[i].disabled)){field[i].checked = status;}
    }
return status; 

}

function getcheckvalue()
{
var c = "";
var k = 0;
var a = document.pubmed.term.value;
var g;


for (var i=0; i < (document.pubmed.journal.length); i++)
   {
   if (document.pubmed.journal[i].checked)
      {
      c =  c + document.pubmed.journal[i].value + "[Journal]" + " OR ";
      k++;
      }
   }

if (k>0) {
   g = c.length - 4;
   c = c.substr(0,g);
   document.pubmed.term.value = c + " AND (" + a + ")";
     }

if (k=0)
   {
   document.pubmed.term.value = a;
   }
}