var min=10;
var max=15;
var htmlelements = new Array();

htmlelements[0] = 'div';
htmlelements[1] = 'table';
htmlelements[2] = 'a';
htmlelements[3] = 'span';
htmlelements[4] = 'form';
htmlelements[5] = 'body';
htmlelements[6] = 'p';
//htmlelements[6] = 'tr';
//htmlelements[7] = 'Table';

function increaseFontSize(textsize) 

{

   for(element=0;element<htmlelements.length;element++) {
   var p = document.getElementsByTagName(htmlelements[element]);
 
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize ) {
     
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      //if(s<=max && s>=min) {
         s = textsize;
     // }
      p[i].style.fontSize = s+"px"
   }
   }
   
}


function decreaseFontSize() {
for(element=0;element<htmlelements.length;element++) {
   var p = document.getElementsByTagName(htmlelements[element]);
   for(i=0;i<p.length;i++) {
      if(p[i].style.fontSize ) {
       
         var s = parseInt(p[i].style.fontSize.replace("px",""));
      } else {
         var s = 10;
      }
      if(s!=min) {
         s -= 1;
      }
      p[i].style.fontSize = s+"px"
   }      
   }
}