JS, functions, paramaters not passing

[zeroradius]

Sorry for the onsalught of simple question I've been asking..... time for another. (as i mentioned in another thread this is my first time using JS for anything more complicated than alert())

Ok so to my problem. I have a script that is supose to load the next element in an array when a button is clicked. I have tried putting the code in various places (header, body) I have tried sevral variations as well. By using a set of document.write() comands I found that it is not passing the paramaters to the picforward() and picbackward() functions. It confuses me because it was working and I just changed around the dunction names because they were backwards and it stopped working. I cant get it to work again no matter what i do (i also can't remember the code i had that worked......) I am passing the paramaters the way it tells me to in head first javascript but i just can't get it going again.

 <script type="text/javascript">
				var a=0;
					function changepic(direction)
					{
						var direct = direction;
						//document.write(a);
						if(direct = "back")
						{
							//document.write(a);
							a = picbackward(a);
							return;
						}
						if(direct = "forward")
						{
							a = picforward(a);
							return;
						}
						else
						{
							alert("A problem has occured");
						}
					}
					
					function picforward(k)
					{
						document.write(k);
						var j = k;
						j=j+1;
						document.getElementById("myPic").src=pic[j];
						return j;
					}
					function picbackward(k)
					{
						var j=k;
						j=j-1;
						document.getElementById("myPic").src=pic[j];
						return j;
					}
            </script>

             <button name="backward" onClick=changepic("back")> Back</button>
             <button name="forward" onClick=changepic("forward")> Forward </button>

[kotg2]

You need to change the if statements so they are using the comparsion operator instead of the assignment operator, so
"if(direct =" should be "if(direct ==".

Also you need to add some additional code to ensure you don't stray outside the bounds of your array:

function picforward(k)
{
document.write(k);
var j = k;
j=j+1;

if(j <= 9)
{
document.getElementById("myPic").src=pic[j];
return j;
}
return k;
}
function picbackward(k)
{
var j=k;
j=j-1;

if(j >= 0)
{
document.getElementById("myPic").src=pic[j];
return j;
}
return k;
}