function processDataTemp(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }
   var Str = form.Depth[i].value

   document.map.src = "images/temperat/t" + Str + ".gif" ;
}


function processDataSal(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/salinity/s" + Str + ".gif" ;
}


function processDataOxy1(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/oxy_ml/o" + Str + ".gif" ;
}

function processDataOxy2(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/oxy_2/ox" + Str + ".gif" ;
}


function processDataNitr(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/nitrate/n" + Str + ".gif" ;
}


function processDataAmnitr(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/am_nitr/am" + Str + ".gif" ;
}

function processDataOrgnitr(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/or_nitr/on" + Str + ".gif" ;
}


function processDataPhosph(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/phosph/p" + Str + ".gif" ;
}


function processDataOrgphos(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/or_phos/op" + Str + ".gif" ;
}


function processDataSil(form) {

for ( var i = 0; i < form.Depth.length; i++ ){
       if (form.Depth[i].checked){
           break
           }
   }

   var Str = form.Depth[i].value
   document.map.src = "images/silicate/si" + Str + ".gif" ;
}


 if (document.images) { 
     
    tempon= new Image();
    tempon.src="images/but/but1temp.jpg";
    tempoff= new Image();
    tempoff.src="images/but/but2temp.jpg";

    salon= new Image();
    salon.src="images/but/but1sal.jpg";
    saloff= new Image();
    saloff.src="images/but/but2sal.jpg";
	
	oxy1on= new Image();
    oxy1on.src="images/but/but1oxya.jpg";
    oxy1off= new Image();
    oxy1off.src="images/but/but2oxya.jpg";
	
	oxy2on= new Image();
    oxy2on.src="images/but/but1oxyb.jpg";
    oxy2off= new Image();
    oxy2off.src="images/but/but2oxyb.jpg";
	
	nitron= new Image();
    nitron.src="images/but/but1nitr.jpg";
    nitroff= new Image();
    nitroff.src="images/but/but2nitr.jpg";
	
	amnitron= new Image();
    amnitron.src="images/but/but1amnt.jpg";
    amnitroff= new Image();
    amnitroff.src= "images/but/but2amnt.jpg";
	
	orgnitron= new Image();
    orgnitron.src="images/but/but1orgn.jpg";
    orgnitroff= new Image();
    orgnitroff.src="images/but/but2orgn.jpg";
	
	phoson= new Image();
    phoson.src="images/but/but1phos.jpg";
    phosoff= new Image();
    phosoff.src="images/but/but2phos.jpg";
	
	orgphoson= new Image();
    orgphoson.src="images/but/but1orph.jpg";
    orgphosoff= new Image();
    orgphosoff.src="images/but/but2orph.jpg";
	
	silon= new Image();
    silon.src="images/but/but1sil.jpg";
    siloff= new Image();
    siloff.src="images/but/but2sil.jpg";
	
    }

    function imgOn(imgName){
	    if (document.images){
		   document[imgName].src=eval(imgName + "on.src");
		   }
    }

    function imgOff(imgName){
	     if (document.images){
                 document[imgName].src=eval(imgName + "off.src");
             }
    }