Display table row width doesn't fix - html

Question

I'm trying to make the div have same height so i used display table , problem that i having is the width will grow.
As an example try adding content in the tableright , when it is exceeded the width , it will not break to the next line but it will expand horizontally to the tableleft.
Please Advice.
Below is the sample code
<div id="maintable">
<div id="table-row">
<div id="tableleft></div>
<div id="tableright></div>
</div>
</div>
<style>
#maintable
{display:table;
width:100%;
}
#table-row
{
display:table-row
width:100%;
}
#tableleft
{
width:60%;
display:table-cell;
}
#tableright
{
width:40%;
display:table-cell;
}
</style>

Answer 1

You made few syntax error there.
Further to make sure if one big un spaced word is placed in table-cell i have used "table-layout: fixed;"
check this fiddle: http://jsfiddle.net/5q9K8/17/
The HTML:
<div id="maintable">
<div id="table-row">
<div id="tableleft">lorem</div>
<div id="tableright">ipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsumipsum</div>
</div>
</div>
The Css:
#maintable
{
display:table;
width:100%;
table-layout: fixed;
word-wrap:break-word;
}
#table-row
{
display:table-row;
width:100%;
}
#tableleft
{
width:60%;
display:table-cell;
background: #eef;
}
#tableright
{
width:40%;
display:table-cell;
background: #efe;
}

Answer 2

Add width as accordingly here just an example to show div height equal to table height.
css
.maintable {
width:100%;
display: table;
border: 1px solid blue;
}
.maintable .table-row {
display: table-row;
border: 2px solid black;
}
.maintable .table-row .tableleft, .maintable .table-row .tableright {
display: table-cell;
border: 4px solid red;
}
.tableright {
width: 60%;
}
.tableleft {
width: 40%;
}
DEMO
Final DEMO